[单选题]
In making a transition from8za rp3 qk8n v+jj(gfw2 rsicmn() l0arp(h-7 state n = 1 to state n = 2, the hydrogen6og qb85naj2*p64m uda y7gid atom must
A. absorb a photon of energy 10.2 eV.
B. emit a photon of energy 10.2 eV.
C. absorb a photon of energy 13.58 eV.
D. emit a photon of energy 13.58 eV.