Answer the following question given this paragraph: 

All chemical reactions, even exothermic reactions, need a certain amount of energy to get started. This energy is called activation energy . For example, activation energy is needed to start a car. Turning the key causes a spark that activates the burning of gasoline in the engine. The combustion of gas won’t occur without the spark of energy to begin the reaction.


Q: The energy a chemical reaction needs to get started is called what kind of energy?

 Choices:

- function

- conduction

- fusion

- activation

A:
activation
