What happens to the atoms in a scoop of ice cream as it melts? a. they decrease in temperature. b. they lose energy. c. they vibrate faster. d. they are held tightly in a fixed position.

The correct answer is 
C. They vibrate faster.

In fact, atoms and molecules inside a solid are bound together, so they cannot move freely, but they can only vibrate around their equilibrium position. As the ice cream melts, the temperature of the ice cream increases and the atoms vibrate faster and faster. (eventually, they break their bounds and they are free to move, since the ice cream becomes liquid).

Ihope you get it right bro

Efficiency is an action of doing something. for example when you take a test. good efficiency means you did well but bad effeciency or no effiency means you did bad.