The question "is the material well researched? " evaluate what about a web resource?

a. currency

b. authority

c. relevance

d. reliablity

d. reliablity

Explanation:

A web resource can give many outcomes of the researched topics some of them attains the relevancy but others sometimes do not. Therefore, a search engine or a web portal is expected to give reliable results of the searched content.

hydrogen is a compound or a single element and a element is a pure substence that cannot be separated into simpler subtances

clorine is a compound its a chemical substance that forms when two or more different elements combine

so both hydrogen and clorine are compounds