How are low-mass red giant stars important to our existence?

Question

 How are low-mass red giant stars important to our existence? 

 Answers:  

a. These stars manufactured virtually all the elements out of which we and our planet are made. 

b. These stars generate the energy that makes life on Earth possible. 

c. These stars manufactured most of the carbon atoms in our bodies. (Correct Answer)

d. These stars provide most of the light that reaches us from globular clusters.