Balance the following SYNTHESIS chemical reaction with the correct coefficients: ___Al (s) + ___S (s) --> ___Al2S3 (s)

a
1, 2, 3
b
2, 3, 1
c
1, 1, 2
d
3, 2, 1

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?