I Want to Know Which Insect Is Eating My Tomatoes

Multiple Choice

I want to know which insect is eating my tomatoes.I notice that the tomato plants with ladybugs, butterflies, and moths are fine.The tomato plants with ladybugs, butterflies, moths, and caterpillars are partially eaten.So I conclude that the caterpillars are eating my tomatoes.Which method did I use to determine this?

A) agreement
B) difference
C) joint method
D) concomitant variations
E) residues