Would phenobarbital, atropine, or serotonin have blocked naloxone binding at a concentration of 10–5 m?

"hydrogen bonding is the attraction of h atoms in the water molecule (slight + charge) to o atoms in a neighboring water molecule (slight - charge); it is a weak interatomic force. but it is still strong enough to the water molecules "stick" together."

i'm assuming that the correct answer is indeed the first one/ "a"..