複選題

2. A function f on R is odd if f(-x)"=-f(x) for all xR while it is even if f(-x) = f(x) for all x  R. Suppose that g and h are two functions on R. 

(a) If g is an even function, then the composite function h o g must be even.
(b) If g is an odd function and , then the limit must be -3.(c) If g is an even function and , then the limit must be 3.

Among the above three statements, how many of them are true?
(A)Only one.
(B) Only two.
(C)All of them.
(D) None of them.