If three electrons are available to fill three empty 2p atomic orbitals, how will the electrons be distributed in the three orbitals?

Think of it this way: say orbitals are boxes and each box can contain 2 electrons.

If there are 3 boxes forming one orbital, it takes 6 electrons to completely fill it. Since there's less than six, each box takes one electron, so there's 1 electron per orbital.

Show an image of the data (˵¯͒ བ¯͒˵)