<u>Answer:</u> The correct answer is Option B.
<u>Explanation:</u>
For the given options:
<u>Option A:</u> Plus sign is written in a chemical equation to show the number of chemical species reacting or getting produced.
Option B: Subscript numbers are defined as the number of atoms of each element present in a compound.
For Example: In
, 2 atoms of hydrogen element is there and 1 atom of oxygen element is there.
<u>Option C:</u> Coefficients are defined as the numbers which are written in front of the atoms or molecules in a chemical reaction. They represent the number of moles of substance in a chemical reaction.
<u>Option D:</u> Chemical symbols are used to write the short form of the elements.
Hence, the correct answer is Option B.