The energy of a UV wave from the sun becomes part of the internal energy
of the sidewalk causing the sidewalk to heat up, then the wave's energy
was *
a) absorbed
b) transmittted
c) reflected

a. absorbed

Explanation:

This is because for the internal energy of the sidewalk to increase, its temperature and thus its internal energy must increase. This causes it to heat up and this is done by absorbing energy from the UV wave.

im srry but ur wrong the answer is d a smooth rock, some red dirt, and an empty bird's nest.