A popular hill station with a pleasant climate in Manipur is:

Tamenglong
Chandel
Ukhrul
Churachandpur

The correct answer is: Ukhrul.

Ukhrul is a hill station in Manipur, India. It is located in the north-eastern part of the state, at an altitude of 1,500 meters above sea level. The town is surrounded by hills and forests, and has a pleasant climate. Ukhrul is a popular tourist destination, and is known for its scenic beauty, temples, and monasteries.

Tamenglong is a town in the Tamenglong district of Manipur, India. It is the headquarters of the district. The town is located at an altitude of 1,500 meters above sea level. Tamenglong is a popular tourist destination, and is known for its scenic beauty, temples, and monasteries.

Chandel is a town in the Chandel district of Manipur, India. It is the headquarters of the district. The town is located at an altitude of 1,000 meters above sea level. Chandel is a popular tourist destination, and is known for its scenic beauty, temples, and monasteries.

Churachandpur is a town in the Churachandpur district of Manipur, India. It is the headquarters of the district. The town is located at an altitude of 700 meters above sea level. Churachandpur is a popular tourist destination, and is known for its scenic beauty, temples, and monasteries.

In conclusion, the correct answer is Ukhrul.