1. The reaction rate ratio is constant (i.e. R3alpa and R12C(a,g) are changed by the same amount):

a). 15 Msun star

b). 20 Msun star

c). 25 Msun star

2. Only R3alpha varies (i.e R12C(a,g) constant):

a). 15 Msun star

b). 20 Msun star

c). 25 Msun star

3. Only R12C(a,g) varies (i.e R3alpha constant):

a). 15 Msun star

b). 20 Msun star

c). 25 Msun star