单选题 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