Introduction:
The latitude which passes through Sikkim also passes through Rajasthan.

Explanation:
- Latitude is a geographic coordinate that specifies the north-south position of a point on the Earth's surface. It is measured in degrees, minutes, and seconds of arc.
- Sikkim is a state in northeastern India, located in the eastern Himalayas. It is bordered by Tibet (China) in the north and northeast, Bhutan in the east, Nepal in the west, and the Indian state of West Bengal in the south.
- Rajasthan is a state in northern India, located on the northwestern part of the Indian subcontinent. It is the largest state by area in India and is known for its rich history, vibrant culture, and architectural marvels.

Reason for the correct answer:
- The latitude which passes through Sikkim also passes through Rajasthan because both Sikkim and Rajasthan are located on the same parallel of latitude.
- Latitude lines run horizontally around the Earth, parallel to the Equator.
- Sikkim is situated at approximately 27 degrees 30 minutes north latitude, while Rajasthan is located between approximately 23 degrees 30 minutes and 30 degrees 12 minutes north latitude.
- Therefore, the latitude that passes through Sikkim also passes through Rajasthan, as both fall within the same range of latitudes.

Incorrect options:
a) Punjab: Punjab is a state in northern India, located to the northwest of Rajasthan. The latitude that passes through Sikkim does not pass through Punjab.
c) Uttarakhand: Uttarakhand is a state in northern India, located to the northeast of Rajasthan. The latitude that passes through Sikkim does not pass through Uttarakhand.
d) Himachal Pradesh: Himachal Pradesh is a state in northern India, located to the north of Punjab and Uttarakhand. The latitude that passes through Sikkim does not pass through Himachal Pradesh.

Conclusion:
The latitude that passes through Sikkim also passes through Rajasthan. This is because both Sikkim and Rajasthan are located on the same parallel of latitude, falling within the range of approximately 23 degrees 30 minutes to 30 degrees 12 minutes north latitude.