Which statement about the elements in the periodic table is true

In my opinion the last one is true because if you add potassium into water it gives a nice spark with hydrogen let it out and evidence to back it up is by coughing.

If you add more potassium into water the more it would react that's why the last answer is correct

The answer is last question

"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."