Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
\[
\text{Assertion (A): In printmaking `ACID' is the main part in creating print ready art work in ETCHING.}
\]
\[
\text{Reason (R): Zinc, aluminium, copper sheets are mainly used for ETCHING. While stone drawing slate treated with `Acid'.}
\]
In the light of the above statements, choose the most appropriate answer from the options given below: