Choose the correct option out of the following choices.

Assertion: Rayon is a semi-synthetic polymer and is taken as a better choice than cotton fabric. 

Reason:Mechanical and aesthetic properties of cellulose can be improved by acetylation.

Assertion and Reason both are correct statement and the reason is the correct explanation for the assertion.

Assertion:
Rayon, also known as cellulose acetate, is a semi-synthetic polymer that has superior properties to natural cotton fibre. Due to this, it is taken as a better choice than cotton fibre. Hence, the assertion is a correct statement.

Reason:
The mechanical and aesthetic properties of cellulose can be improved by acetylation. Hence, Rayon, a product of acetylation of cellulose, has better properties than cotton. Hence, the reason is a correct statement.