What is the purpose of the section titled A Chemical Reaction?

Responses
A To inform the reader that hair-dyeing involves using chemicalsTo inform the reader that hair-dyeing involves using chemicals
B To persuade the reader to delay the hair-dyeing processTo persuade the reader to delay the hair-dyeing process
C To describe the chemicals found in common hair dyesTo describe the chemicals found in common hair dyes
D To narrate to the reader a commonly known story of hair dyeingTo narrate to the reader a commonly known story of hair dyeing

A To inform the reader that hair-dyeing involves using chemicals