What is transmutation? A. the end product of radioactive decay
B. one type of radioactive decay
C. the steps that make up a decay series
D. the conversion of one element into another

D. the conversion of one element into another

Explanation:

Transmutation is the action of changing or the state of being changed into another form. Therefore, D is the correct answer choice.

idk what the question is about

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.