Answer:
C - a stack of 15.6 watermelons
Explanation:
Lets first go through each option:
"A shopping receipt that totals $4.90":
This is an appropriate answer since many items sold are not priced at exact dollars (where there are no cents), so having $4.90 as the total cost after shopping is appropriate.
"A soccer game where the average score is 4.7":
This is also an appropriate result since it is the average score of a soccer game, so finding a decimal is appropriate.
"A stack of 15.6 watermelons":
This is not an appropriate result since it would be strange to say a 'stack' or group of something that is not a whole number.
"A classroom with 24 students":
This is an appropriate result since the number of students is a whole number not a decimal.
Hope this helps :)