Option 1: (A), (B) and (D) only -> Statement (B) is incorrect as plasma contains ~90-92% water, not 70%. Statement (D) is incorrect as WBCs, not RBCs, provide defense against infections.
Option 2: (A), (B) and (C) only -> Statement (B) is incorrect about plasma composition (should be ~90-92% water, not 70%).
Option 3: (A), (C) and (D) only -> Statement (A) correctly states blood volume. Statement (C) correctly describes hemoglobin's oxygen-binding function. However, statement (D) is scientifically incorrect as RBCs transport oxygen, while WBCs provide immune defense.
Option 4: (B), (C) and (D) only -> Excludes statement (A) which is correct. Includes statements (B) and (D) which are incorrect.
Look, we know (D) is wrong because basic biology exists, but NTA's answer key had other plans. Another NTA masterpiece - don't blame us, we're just messengers of their creative grading!
However, following the given answer: Option 3: (A), (C) and (D) only