A science teacher gives the presentation assignment below. Let’s make our families earth-friendly. Consider whether or not your family respects the environment. Discuss your routines and practices with your parents, and determine your family’s "footprint." Then, suggest to your peers one earth-friendly effort that every family should make. Which statement best expresses a strong claim for the presentation? a. Families ought to throw away those nasty canned vegetables in their pantries and embrace the new trend of buying local produce. b. Every family should buy local produce because it is more nutritious, it requires less packaging, and it promotes energy conservation. c. Families need to stop driving to super stores ten miles away to buy apples from another coast or oranges from five states south. d. Every family should consider driving or walking to a local farm and selecting produce, such as cucumbers, carrots, and lettuce.

B). Every family should buy local produce because it is more nutritious, it requires less packaging, and it promotes energy conservation.

Explanation:

As per the given presentation, option B clearly displays a strong claim which the teacher wishes to convey to his/her students. The teacher aims to profess it successfully that 'every family should buy local produce as it is more nutritious which promotes a better health and along with that it requires lesser packaging which assists in encouraging an earth/environment friendly and energy conservation approach'. This claim or intention of the teacher is clearly reflected by the phrases like 'Let’s make our families earth-friendly', 'respects the environment', 'earth-friendly effort that every family should make', etc. Therefore, option B best expresses a potent claim of the given presentation.

the present continuous is a verb tense which is mainly used to indicates that an action is in progress at the moment of speaking.  

it is formed using: person + verb to be (am/is/are) +verb + - ing form  

example: i am studying at this moment .

in addition, the present continuous is also used in order to express things that will or will not happen in the near future.

example: i am having dinner with some friends tonight.

the speaker sometimes   uses it   to express that an action is repeated and it causes irritation on the part of the speaker

example: my sister is constantly complaining about everything.