Later in the Course, We Will Compare the Halogenation of Differently

Later in the course, we will compare the halogenation of differently substituted carbons, comparing reactions like the ones below. Which of the following reactions has a more exothermic heat of reaction ( $\Delta$ H^o) ?

A) Reaction A has a more exothermic heat of reaction ( $\Delta$ H^o)
B) Reaction B has a more exothermic heat of reaction ( $\Delta$ H^o)
C) Both reactions have the same heat of reaction ( $\Delta$ H^o)