Which of the statements is true?

The correct answer is D. All of the above.

Amar Mahal Palace is a palace located in Jammu, India. It was built by Raja Amar Singh in the 18th century. The palace is located on the bank of Ravi river. In 1972, Dr. Karan Singh gave the palace to a Trust for use as a Museum. The palace is now a museum that houses a collection of artifacts from the Dogra period.

Here is a brief explanation of each option:

• Option A: Amar Mahal Palace is located on the bank of Ravi river. This is true. The palace is located on the bank of Ravi river in Jammu, India.
• Option B: It was built by Raja Amar Singh in the 18th Century. This is also true. The palace was built by Raja Amar Singh in the 18th century.
• Option C: It was given to a Trust by Dr. Karan Singh for use as a Museum. This is also true. In 1972, Dr. Karan Singh gave the palace to a Trust for use as a Museum.

Therefore, the correct answer is D. All of the above.