(D) Assertion (A) is false, but Reason (R) is true.
The Assertion is false — more pixels means better image quality, as the image more closely resembles the original. The Reason is true — resolution refers to the number of pixels, determining clarity and detail.
The textbook clearly states: "The more pixels you have, the more closely the image resembles the original." So the Assertion is factually incorrect. The Reason correctly defines resolution. Since A is false and R is true, option (D) is correct. Always check Assertion and Reason independently before picking an option.