How Does Mill Respond to the Objection That Pleasure and Pain

Multiple Choice

How does Mill respond to the objection that pleasure and pain cannot be the only things desirable as an end because people sometimes sacrifice their own pleasure or endure great pain to achieve some other goal?

A) By pointing out that some people are confused about which things are desirable as an end.
B) By insisting that such people are acting under religious delusions.
C) By denying that such sacrifices are motivated by rational thought.
D) By arguing that any such sacrifice is to promote someone else's pleasure or spare someone else pain.