Step 1: Coccidae (soft scales) and Flatidae (planthoppers) are unrelated insect groups, so both are ruled out.
Step 2: Pseudococcidae is the family for most common mealybugs, but the mango mealybug, Drosicha mangiferae, is an exception.
Step 3: Drosicha mangiferae is classified under Margarodidae.
Step 4: Correct answer: Margarodidae.