A is false and you don't want to mark that because there are four terms.
B is also false, the coefficient of the first term is 2.
C is correct and mark that one, 5 is the coefficient of the second term
D is correct and you should mark it, there are four terms in that expression
E is false, the coefficient is 7 not y
F is true so mark it, the coefficient of the first term is 2