The opposite of sloppily in English would be cleanly or neatly - lo contrario de sloppily en inglés sería cleanly or neatly.
"of insects" is an adjective phrase because it's a prepositional phrase that acts as an adjective. It modifies the word "group"; In other words, "of insects" is used to describe the word "group".
I think it's between A and B...
i havent done this in a while sorry i cant be of more help :(
A. Make sure your windows are closed tightly
