This question involves tropical areas.
The area on the equator will have a hot and rainy climate all year round. The areas near the equator will have a hot climate, and have a rainy season. The Tropic of Cancer, which is north of the equatorial region, has a hot and dry climate for most of the year. The Tropic of Capricorn, which is south of the equatorial region, has a mostly wet climate, and has a rainy season.
Based on this information, the answer is C. City X is on the equator, while City Y is just north of the equator.