If stock A and stock B are positively correlated, then

(a) the expected values of both stock A and stock B are positive

(b) when stock A obtains a positive return then stock B tends to also realize a positive return

(c) when stock A obtains a return above its mean then stock B tends to realize a positive return

(d) when stock A obtains a return above its mean then stock B tends to realize a return that is above its mean