Given below are two statements, one labeled as Assertion (A) and the other labeled as Reason (R). **Assertion (A):** Graphene is an excellent conductor of electricity, yet it cannot be directly used to make digital transistors without modification. **Reason (R):** Graphene is a zero-bandgap semimetal, meaning it lacks a bandgap required to switch the electrical current 'on' and 'off' effectively. In the context of the above statements, which of the following is correct?

Options:

• A: Both A and R are true but R is not the correct explanation of A.
• B: A is true but R is false.
• C: Both A and R are true and R is the correct explanation of A.
• D: A is false but R is true.

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