Answer: D
<u>Step-by-step explanation:</u>
Let x represent the score on her next test


78 + 92 + 88 + 89 + x = 5(90)
347 + x = 450
<u> -347 </u> <u>-347 </u>
x = 103
Each classroom donated around 320 cans(or more) of food.
320x28=8,960.
4 quarts are in a single gallon