Which of the following statements about stars is true?

a.) all stars are the same temperature
b.) none of these
c.) stars rarely differ in temperature
d.) stars vary greatly in temperature

The correct option is D) Stars vary greatly in temperature

Explanation:

The temperature range for different type of stars varies from 3,000 Kelvin to 50,000 Kelvin. A red star is generally considered to be a lot cooler than a blue star or a white star. The stars which are bigger have more energy and usually have very high temperatures. The smaller stars are smaller star has less energy and has low temperatures. Hence, we can say that stars vary greatly in temperature.

i think a) betsy can donate only blood to mark is correct because, mark and betsy have the same blood type. whereas nobody else has b+ blood so betsy can't donate to them.