Explanation:

- Option 1: MV Pylee

- MV Pylee was a well-known scholar and his focus was largely on political science and constitutional law in India.

- He has significantly contributed to the studies around the Indian Constitution but did not coin the phrase for Article 32.

- Option 2: BR Ambedkar

- Dr. BR Ambedkar is regarded as the principal architect of the Constitution of India.

- He termed Article 32 as the ‘heart and soul of the Constitution’ due to its pivotal role in enforcing fundamental rights.

- Article 32 provides remedies for the enforcement of fundamental rights, enabling individuals to move the Supreme Court when their rights are violated.

- Option 3: Jawaharlal Nehru

- As India's first Prime Minister, Nehru played a significant role in its political landscape but did not coin this phrase.

- Option 4: Sachchidananda Sinha

- Sinha was the interim President of the Constituent Assembly but didn't term Article 32 as the 'heart and soul'.

Your Answer: Option 2 - BR Ambedkar