The maximum cost-per-click (CPC) bid is the:

The maximum cost-per-click (CPC) bid is the:

A)  amount an advertiser is required to pay to achieve top ad position
B)  actual amount an advertiser pays for each click on an ad
C)  most an advertiser is willing to pay for each click on an ad
D)  amount an advertiser must pay to outbid competitors

Answer : most an advertiser is willing to pay for each click on an ad

Reason :

Maximum CPC bid: Definition

A bid that you set to determine the highest amount that you're willing to pay for a click on your ad.

Read more at https://support.google.com/adwords/answer/6326?hl=en