The substance yielded as a result of a chemical reaction is?
a. product
b. reactant

product

Explanation:

Reactants of a chemical reaction is defined as the substances which take part in a chemical reaction and undergoes a chemical change. Reactants are written on left side of the arrow.

Products are defined as the substance which are formed at the end of the chemical reaction. Products are written on the right side of the arrow.

For example:

Here, and are reactants whereas and are products.

let that person have a turn to speak : )

c-14 is carbon-14, or radiocarbon.   it is a radioactive isotope of carbon with an atomic nucleus containing 6 protons and 8 neutrons.