Hydrogen bonds between water molecules are than covalent bonds.

Weaker

Explanation:

Without any other context, i'm going to assume that this is comparing the strength of Van der Waals force and covalent bonds.

Van der Waals forces are inter-molecular forces generated because of the polar nature of the water molecule. These are weaker than intra-molecular covalent bonds (which involve sharing of electrons)

i think that c)gold was found there

but i am not sure

the alkaline earth metals (beryllium (be), magnesium (mg), calcium (ca), strontium (sr), barium (ba), and radium (ra)) are a group of chemical elements in the s-block of the periodic table with very similar properties: shiny. silvery-white. hopefully this ? i didn't fully understand the question