Pre-cursors to photochemical oxidants are
(A) $\mathrm{NOx}, \mathrm{VOCs}$ and sunlight
(B) $\mathrm{SO}_{2}, \mathrm{CO}_{2}$ and sunlight
(C) $\mathrm{H}_{2} \mathrm{~S}, \mathrm{CO}$ and sunlight
(D) $\mathrm{SO}_{2}, \mathrm{NH}_{3}$ and sunlight
Pre-cursors to photochemical oxidants are
(A) $\mathrm{NOx}, \mathrm{VOCs}$ and sunlight
(B) $\mathrm{SO}_{2}, \mathrm{CO}_{2}$ and sunlight
(C) $\mathrm{H}_{2} \mathrm{~S}, \mathrm{CO}$ and sunlight
(D) $\mathrm{SO}_{2}, \mathrm{NH}_{3}$ and sunlight