Please help me, I will give BRAINLIEST to the best answer

Which of the following is having work done on it? (Circle all that apply).
a. A grocery bag as you lift it up
b. A crane moving dirt
c. A person sitting on a bench
d. A crate as you push it along the floor

Asimply means that over time there was some sort of change.

Starting with only the balmer series light (visible light), how could we ensure that the solar panels generate a current that mark can use for his power station? a)by gradually increasing the brightness (amount) of light that we shine on it. b)by gradually increasing the frequency of the light we shine on it. c)by gradually increasing the wavelength of the light that we shine on it.

It is really hard for me right know