The correct answer is Option 3: A-4, B-3, C-2, D-1.

Let`s go through each option and match the service/agency with the respective country:

A. Foreign Intelligence Service - This is the main foreign intelligence agency of Russia, also known as the SVR. It is responsible for gathering intelligence and conducting operations outside Russia`s borders. Therefore, A corresponds to Russia. This matches with option 3, which places A as 4 (Russia).

B. Ministry of State Security - This is the main intelligence agency of China, also known as the MSS. It is responsible for intelligence collection, counterintelligence, and internal security. Therefore, B corresponds to China. This matches with option 3, which places B as 3 (China).

C. Secret Intelligence Service - This is the foreign intelligence agency of the United Kingdom, commonly known as MI6. It is responsible for gathering intelligence and conducting covert operations abroad. Therefore, C corresponds to Britain. This matches with option 3, which places C as 2 (Britain).

D. The Mossad - This is the national intelligence agency of Israel. The Mossad is responsible for intelligence gathering, covert operations, and counterterrorism. Therefore, D corresponds to Israel. This matches with option 3, which places D as 1 (Israel).

Therefore, the correct answer is Option 3: A-4, B-3, C-2, D-1, as it correctly matches each service/agency with the respective country based on the given information.