单项选择题

Considering the () of available options for investing one’s hard-earned retirement funds, as evidenced by a plethora of daytime television advertisements aimed at appealing to the incapacitated senior, you may well find it difficult to avoid feeling ()

A.diversity … ingratiated
B.dearth … belligerent
C.gamut … overwhelmed
D.appeal … mortified
E. periodicity … exhausted