Which of the following could be considered a scientific statement? a. Solar power is our favorite source of electricity
b. Soda a taste better than soda b
c. Blue light is the most beautiful color of light
d. X rays have lower frequency than mircowaves

D

Explanation:

the other answers are not scientific statements because they are opinions that can't be backed up

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.