Consider a Truss Designed to Support Some Maximum Weight W

Consider a truss designed to support some maximum weight W on a frictionless, horizontal surface. The truss has three straight members joined as in the letter "A," and all members of the truss are weightless. W is placed at the apex of the truss. A single modification that would permit stable support of a weight heavier than W for a given strength of the horizontal cross member is to

A) move the horizontal cross member toward the apex of the truss.
B) move the horizontal cross member toward the floor.
C) move the horizontal cross member to the exact midpoint of the distance from apex to floor.
D) none of the above.