What Does It Mean, According to Mill, for One Pleasure

Multiple Choice

What does it mean, according to Mill, for one pleasure to be of higher quality than another?

A) One pleasure is of higher quality than another if the first is more permanent, less risky, and less costly.
B) One pleasure is of higher quality than another if pursuing the first pleasure more effectively promotes the general happiness than does pursuing the second pleasure.
C) One pleasure is of higher quality than another if someone who is acquainted with both will always choose the first over the second, regardless of quantity.
D) One pleasure is of higher quality than another if the first pleasure is more intense than the second.