It's not a cause to help others, but to help themselves. The seniors of Altamont High want the administration of their school to add a coffee bar to the library. A coffee bar, the seniors argue, would make students more likely to visit the library and be tempted to read books. They also believe that a coffee bar would help make money for the school. As an added bonus, seniors also claim that they will be much more awake for first period. Although the seniors are putting up signs and doing press interviews, the principal of Altamont High School has yet to comment on the matter. Which sentence serves as the best introductory sentence to the above paragraph

This question is missing the options. I have found the complete question online. Since the passage is the same, I will omit it:

Which sentence serves as the best introductory sentence to the above paragraph?

A. Coffee can be quite stimulating and help students focus.

B. Seniors at Altamont High School are working for an unusual cause.

C. Some people wish that they had coffee available before their earliest class.

D. Some parents are opposed to having coffee served in the school library.

The sentence that serves as the best introductory sentence to the paragraph is:

B. Seniors at Altamont High School are working for an unusual cause.

Explanation:

An introductory sentence serves as a guide for readers, so that they will have an idea of what they are about to read. It also serves to catch readers' attention, making them curious and interested.

In this case, a good way to choose an introductory sentence is by simply matching the different options to the first sentence of the paragraph. If they are a good match, if one sentence completes the meaning and message of the other, then we have found our introductory sentence. Let's give each option a try.

A. Coffee can be quite stimulating and help students focus. It's not a cause to help others, but to help themselves. → The two sentences do not match. There is nothing about a cause in the introductory sentence. INCORRECT

B. Seniors at Altamont High School are working for an unusual cause. It's not a cause to help others, but to help themselves. → This is a perfect match. One sentence is completing the meaning of the other. This option is CORRECT

C. Some people wish that they had coffee available before their earliest class. It's not a cause to help others, but to help themselves. → Again, the two sentences are not working together. INCORRECT

D. Some parents are opposed to having coffee served in the school library. It's not a cause to help others, but to help themselves. → This could make sense if we had more context, but not as it is. The introductory sentence does not necessarily relate to a cause. INCORRECT

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explanation: