Riddle: I get smaller every time I take a bath. What am I?

What object gets smaller every time it's used during a bath or shower?

Is it a) towel b) shampoo c) soap d) sponge

Answer:

The object that gets smaller every time it's used during a bath or shower is c) soap.

When you use a bar of soap during a bath or shower, it gradually decreases in size. This is because soap dissolves in water and wears away as it's rubbed on your body. So, the correct answer to the riddle "I get smaller every time I take a bath. What am I?" is soap.