Which example involves the transformation of chemical energy directly into light energy?

A) a wind mill

B) a glow stick

C) photosynthesis

D) a hydroelectric dam

(I'm pretty sure it's b, but just want to make sure)

Yes, you're right, it's a glow stick!

a glow stick has two substances in it, which are separated from each other and breaking of the glow stick makes them combine and release energy in the form of a light. This process is also known as chemiluminescence. They don't require any other energy sources!