Many reactions are exothermic and undergo an increase in entropy. These types of reactions are thermodynamically favorable. Which of the following accounts for why these reactions are not seen occurring on a day-to-day basis?

A) While the reactions are thermodynamically favorable, they may have a very high activation energy.
B) While the reactions are thermodynamically favorable, they may have a very low activation energy.
C) While the reactions are thermodynamically favorable, they may only occur very slowly over time due to high interactions.
D) These reactions are actually happening too quickly for us to see on a day-to-day basis.