Explanation

The NCERT (Class 10/11) value for the atomic (covalent) radius of hydrogen is 37 pm (37 × 10⁻¹² m); 37 nm (option A) is a thousand times too large. The 52.9 pm Bohr radius is the most probable electron–nucleus distance in the ground state, not the textbook covalent radius cited here, and 17 pm is far too small. Corroborated by ExamRobot (Answer Verified), Testbook, prepp.in and the MissionCAPFHub key, all giving B — the stored key's D (57 pm) was wrong.