Which is a compound that contains carbon?

Option (a) is the correct answer.

Explanation:

A compound is defined as the substance which contains different type of elements that are chemically combined together in a fixed ratio by mass.

For example, is a compound as it contains carbon and hydrogen atoms which are different elements. And, both C and H atoms are combining in 1:4 ratio.

A compound can be chemically broken down into its constituent particles.

An element is defined as the substance that contains only one type of atoms.

For example, element C contains only atoms of carbon.

Thus, we can conclude that out of the given options is a compound that contains carbon.

d. changes in climate and historical records

hope this