Ava made a device that contains two chemicals: lye and a strong acid. When she activates the device, the acid is added to the lye. When these two chemicals mix, they react and produce heat.

When Ava tests the device, she finds that it becomes far too hot but then cools off too quickly. How should Ava change the device to fix these problems?
A.
release the acid into the lye more slowly
B.
remove the lye and only use acid in the device
C.
increase the amount of acid added to the lye
D.
cover the device with a substance that conducts heat

A. release the acid into the lye more slowly