Option 1 states that both statements are individually true and that Statement II is the correct explanation of Statement I. Let`s examine each statement separately.

Statement I asserts that the Doldrums is a calm belt between 5° N and 5° S of the equator. This is a correct statement. The Doldrums, also known as the Intertropical Convergence Zone, is an area near the equator where the trade winds from the Northern and Southern Hemispheres converge, creating calm or light winds.

Statement II states that the sun rays strike almost vertically over the equator throughout the year. This is also a correct statement. The equator receives the most direct sunlight because it is the closest to the sun`s rays. As a result, the equatorial regions experience consistent high temperatures throughout the year.

Option 2 states that both statements are individually true, but Statement II is not the correct explanation of Statement I. This is the correct answer. While both statements are true, there is no direct causal relationship between them. The Doldrums being a calm belt and the sun rays striking vertically over the equator are separate phenomena that occur near the equator.