Carbon (c) and hydrogen (h) are pure substances. each is made of only one type of atom, but carbon atoms are different from hydrogen atoms. carbon and hydrogen chemically combine to form methane (ch4). based on this information: a. carbon and hydrogen are elements and methane is a compound. b. carbon, hydrogen, and methane are all compounds. c. methane is an element and carbon and hydrogen are compounds. d. carbon, hydrogen, and methane are all elements

The answer to your question is: letter A

Explanation:

We can find carbon and hydrogen in the periodic table of the elements then, they are elements. Elements are composed by only one kind of atoms.

We can not find methane in the periodic table so, Methane is a compound. Compounds are composed by 2 or more atoms of the same element or of different elements.

Letter B is incorrect because carbon and hydrogen are elements.

Letter C is incorrect because Methane is a compound and carbon and hydrogen are elements.

Letter D is incorrect because Methane is a compound.

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the electrical  conductivity  of asolution  of an electrolyte is measured by determining the resistance of thesolution  between two flat or cylindrical electrodes separated by a fixed distance.