A is correct
B is the Past Continuous Tense
C is the Future Tense
D is the Simple Present Tense
Turtle eggs ,duck eggs and any other eggs offer a ready source of nutrients .
Writers should include references to their research in an argument because it adds credibility to the argument to the argument they wish to prove.
Apparently it's from the 15th Century's Old French emploier, Latin implicāre to entangle, to engage, from plicāre to fold
