The correct answer is option 'b', Jawaharlal Nehru.

Jawaharlal Nehru served as the first Foreign Minister of free India. Nehru was a prominent leader of the Indian National Congress and played a crucial role in the independence movement against British colonial rule. After India gained independence on August 15, 1947, Nehru became the Prime Minister of India and also took charge of the Ministry of External Affairs, which included the role of Foreign Minister.

Here is a breakdown of Nehru's role as the first Foreign Minister of free India:

1. Jawaharlal Nehru's appointment:
- After India achieved independence, Nehru was appointed as the Prime Minister of India by the Governor-General, Lord Mountbatten.
- As the Prime Minister, Nehru also took charge of the Ministry of External Affairs, which involved handling foreign affairs and diplomatic relations.

2. Nehru's contributions to foreign policy:
- Nehru had a profound impact on India's foreign policy, advocating for non-alignment and promoting peace and cooperation among nations.
- He played a crucial role in shaping India's stance on various international issues and represented the country on the global stage.
- Nehru was a strong advocate for decolonization and supported the independence struggles of various nations.

3. Nehru's role in international organizations:
- Nehru played an active role in various international organizations, such as the United Nations (UN).
- He addressed the UN General Assembly several times, advocating for peace, disarmament, and the rights of developing nations.
- Nehru was one of the founding members of the Non-Aligned Movement (NAM), which aimed to provide an alternative approach to global politics and promote the interests of developing countries.

4. Nehru's diplomatic initiatives:
- Nehru initiated diplomatic efforts to resolve conflicts and improve relations with neighboring countries.
- He played a crucial role in negotiating the Panchsheel Agreement with China in 1954, which aimed to establish peaceful coexistence and respect for sovereignty.
- Nehru also played a significant role in the formation of the Commonwealth of Nations, an organization of former British colonies and current independent states.

In conclusion, Jawaharlal Nehru served as the first Foreign Minister of free India. He played a pivotal role in shaping India's foreign policy, representing the country on the global stage, and advocating for peace, cooperation, and the rights of developing nations.