Question

chemical reactions that yield energy, such as heat, are said to be
exergonic.
activated.
endergonic.
neutral.
reversible.

Explanation:

Exergonic reactions release energy such as heat. Activated refers to a state in a reaction process. Endergonic reactions absorb energy. Neutral doesn't describe energy - yielding reactions. Reversible refers to the ability of a reaction to go in both directions, not to energy - yielding nature.

Answer:

A. exergonic