Answer:
The dollar markdown is:
A. $32.99
Explanation:
It is given that:
At the end of the summer, Walgreens advertised blow-up pools for 66% off the regular price.
Jeff Jones saw a pool with a regular price of $49.99.
i.e. there is a markdown of 66% of the regular price.
i.e. 66% of $ 49.99
which is calculated as:

Hence, the dollar markdown is:
A. $32.99.