Answer:
A.
Step-by-step explanation:
Natan Sharansky is an Israel politician who was held in prison by USSR for the charge of spying to Americans. In 1973, Sharansky applied for exit visa to Israel, which was denied by the USSR agencies on the ground that he has passed high security information to the West. He spent thirteen years of his life in prison.
His story took over the news in the West and won many sympathies from them. The USSR government was pressurised by the American government to release Sharansky. He received support from the Western countries. He was released in a prisoner exchange on 11th February 1986.
So, the correct answer is option A.