The Decrease in Entropy (The $\Delta$ S Value Is Negative) Observed for Alkene Addition Reactions Results

Multiple Choice

The decrease in entropy (the $\Delta$ S value is negative) observed for alkene addition reactions results from _______.

A) the breaking of a π and $\sigma$ bond.
B) the formation of two $\sigma$ bonds.
C) the reaction being exothermic.
D) two molecules reacting to form a single molecule.
E) the temperature dependence of the $\Delta$ S term.