Class A and Class C shares of a mutual fund differ in which of the...

Step by Step Explanation:

Expense Ratio: Class A shares typically have lower ongoing expense ratios but higher front-end sales charges. Class C shares often have higher ongoing expense ratios but no front-end charges.

Incorrect Options:

B: NAV is determined daily and does not vary by share class.

C: All share classes invest in the same underlying portfolio.

D: Purchase timing is the same for all share classes.