Please Help!!: (Question) Nitrogen gas in the atmosphere can combine with to become usable.

(Answer choices)
a. lightning
b. blue-green algae
c. bacteria in the soil
d. animals
e. all of the above
f. Only A, B, and C above

Consider hydrogen in an excited state n = 5n=5 that emits photons to reach the ground state. there are various possible transitions other than straight to the ground state that can occur; for example, it can drop to the n = 3n=3 state followed by the n = 3n=3 to the ground state transition. which of the possible transitions will result in the emission of a photon in the visible region?