The correct answer is (a) Agha Khan Palace, Poona.
Kasturba Gandhi and Mahadev Desai were the wife and secretary of Mahatma Gandhi, respectively. They both died in 1944 while in prison in Poona. Their samadhis (memorials) are located in the premises of the Agha Khan Palace, where they were imprisoned.
The Agha Khan Palace is a historic building in Poona, India. It was built in the 19th century as a residence for the Aga Khan III. The palace was used as a prison during the Indian independence movement, and it was where Kasturba Gandhi and Mahadev Desai were imprisoned and died. After India’s independence, the palace was converted into a museum.
The Samadhis of Kasturba Gandhi and Mahadev Desai are located in the garden of the Agha Khan Palace. The samadhis are simple white marble structures, each with a lotus flower carved on the top. The samadhis are a popular pilgrimage site for Gandhians and other visitors to Poona.