Which of the following determines the rate at which a star generates energy in i

Question

Which of the following determines the rate at which a star generates energy in its core when it is on the main sequence?
      
Nuclear reaction efficiency.
       
Electromagnetism.
       
There's not enough information to answer the question.
       
Carbon fraction.
       
Mass

-Which of the following statements best describes how the lifetimes compare between a star that has a mass equal to the Sun and a star with three times more mass?
      
The more massive star will live three times as long as the solar mass star.
       
The solar mass star will live much more than three times as long as the more massive star.
       
The solar mass star will live three times as long as the more massive star.
       
The two stars will have the same lifetime.
       
The more massive star will live much more than three times as long as the solar mass star.

Explanation / Answer

Here’s the answer to the first question. Please post the second question separately. Thank you.

Ans. Mass - The mass of a star determines the rate at which a star generates energy in its core. Bodies with size less than 0.08 times of the Sun’s mass never ignite as they cannot reach the nuclear fusion stage in their core. Sufficient mass of the star allows collapsing of dust and gas burn hot enough to reach the temperature that can fuse hydrogen into helium (hydrogen fusion) which leads to the star become a main sequence star.

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