To determine which items cost less than $3.99 per item, we need to first calculate the price per item for each of the items listed.
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Watermelons:
- Price = $14.97 for 3
- Price per watermelon = $14.97 / 3 = $4.99
-
Boxes of Cereal:
- Price = $15.80 for 4
- Price per box = $15.80 / 4 = $3.95
-
Bags of Pretzels:
- Price = $10.77 for 3
- Price per bag = $10.77 / 3 = $3.59
-
Ice Cream:
- Price = $18.36 for 4
- Price per tub = $18.36 / 4 = $4.59
Now we can compare these prices with $3.99:
- Watermelons: $4.99 (not less than $3.99)
- Boxes of Cereal: $3.95 (less than $3.99)
- Bags of Pretzels: $3.59 (less than $3.99)
- Ice Cream: $4.59 (not less than $3.99)
The items that cost less than $3.99 per item are boxes of cereal and bags of pretzels.
So the correct answer is: boxes of cereal and bags of pretzels.