Tatiana walked part of the 10-mile distance at 2 miles per hour and rode her bicycle the rest of the way at 12 miles per hour. If the whole trip took 1 hour, how much
time did she spend walking?

First work out the unit price:
16-oz $1.76/16=$0.11 per oz
20-oz $2.40/20=$0.12 per oz

From this the 16-oz bottle is better value for money than the 20-oz because the unit price is lower.
I don’t have any statements in front of me to make an answer selection, but I hope this helps.