The class is selling food at the school fair. pretzels cost $1.50, and bottles of water cost $1.00. the class sold a total of 107 items and collected $128.

Let's assume all the items were bottles of water.

107 * $1 = $107

The difference from the actual result is $21.

If we changed each bottle of water to a pretzel, that would increase by $0.5.

$21 / $0.5 = 42

Hence, the class sold 42 pretzels and (107 - 42) = 65 bottles of water.

a is the right answer