Answer: B
A offhand remark is made without forethought or premeditation.
An aboveboard(open) deed is done without trickery or guile.

Answer: D
The larval (immature) stage of an insect best corresponds to the embryonic stage of a mammal.

Answer: C
An excess of once-pleasing flavors cloys or sates the palate (seat of sense of taste).
An excess of once-tempting foodstuff surfeits or sates the appetite.

Answer: D
A pratfall is a humiliating mishap that causes you fell embarrassment.
A windfall is an unexpected piece of good fortune that causes you to feel jubilation.

Answer: A
Events that are contemporaneous (occurring within same time frame) exist in temporal reference to one another.
Objects that are adjacent exists in spatial reference to one another.

Answer: B
Agitator(troublemaker) and firebrand are synonyms.
Renegade(Traitor) and turncoat are synonyms of each other.