. 1. Which conclusion can be drawn from the fact that water has a lower enthalpy
than the elements from which it is formed?

it should be all of them because it asks if you included all of those in your answer

explanation:

metals are good conductor of electricity. it has free electrons on their surface. according to electron pool theory, each atom present in a metal crystal losses all of its valence electron and as a result a pool of free is form. these pool of electrons are free to move and   conduct electricity easily   while making metal as good conductor.

the correct answer is a. the ability of electrons to flow throughout the metal.

if it's not useful, feel free to report for mistake in answer.