Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R.

Assertion A: The colloidal surfaces of humus are negatively charged.
Reason R: The negative charges arise from exposed functional groups like hydroxyl, carboxylic or phenolic.

In the light of the above statements, choose the most appropriate answer from the options given below:

A

Both (A) and R are true and (R) is the correct explanation of (A)

B

Both (A) and R are true but (R) is NOT the correct explanation of (A)

C

(A) is true but (R) is false

D

(A) is false but (R) is true