A

Step 1: When a hydrogen atom is in the ground state, it has the lowest possible energy level.
Step 2: Raising the hydrogen atom to an excited state requires energy input, which increases the potential energy (P.E.) of the electron due to the increased distance from the nucleus.
Step 3: The kinetic energy (K.E.) of the electron decreases because, according to classical electromagnetic theory, as electrons move to a higher energy level, they are further away from the nucleus, resulting in a decrease in their velocity.
Therefore, when the hydrogen atom is raised from the ground state to an excited state, P.E. increases and K.E. decreases.