Can Speculators Who Expect Prices to Rise Actually Cause Thoseprices

Can speculators who expect prices to rise actually cause thoseprices to rise in the short run?

A) Yes, if they buy up enough of the good, they will increase demand and thus raise the price of the product.(True Answer
) Correct
B) Yes, if they expect the price to rise, sellers will automatically raise prices for their products.
C) No, because speculators do not have enough power to cause an increase in demand.
D) No, because speculators' actions cannot influence a market equilibrium.