Constant Returns to Scale in the Matching Function Means That $e^{xm(Q,A)}$

Multiple Choice

Constant returns to scale in the matching function means that, given any constant x > 0,

A) m(xQ, xA) = xm(Q,A) .
B) m(xQ, xA) > xm(Q,A) .
C) m(xQ, xA) < xm(Q,A) .
D) m(xQ, xA) = $e^{xm(Q,A) }$ .
E) m(xQ, xA) = $\frac{1}{x}$ m(Q,A) .