Explanation:

The Bharat Ratna is the highest civilian award in India. It is awarded in recognition of exceptional service or performance of the highest order in any field of human endeavor. The award was instituted in 1954 and is conferred by the President of India.

In 2019, one personality was awarded the Bharat Ratna. That personality is Nanaji Deshmukh.

Nanaji Deshmukh:
- Chandikadas Amritrao Deshmukh, popularly known as Nanaji Deshmukh, was born on October 11, 1916, in Maharashtra, India.
- He was a social activist, politician, and leader of the Rashtriya Swayamsevak Sangh (RSS).
- Nanaji Deshmukh played a key role in the implementation of various rural development schemes in India.
- He worked towards rural development, education, and empowerment of women.
- Deshmukh was also instrumental in the establishment of the Deendayal Research Institute, a center for applied research in rural development.
- He was a member of the Rajya Sabha, the upper house of the Indian Parliament, from 1999 to 2005.
- Nanaji Deshmukh passed away on February 27, 2010.

Other Personalities:
- Sachin Tendulkar, the legendary cricketer, was awarded the Bharat Ratna in 2014. He is considered one of the greatest batsmen in the history of cricket.
- Lata Mangeshkar, the renowned playback singer, was awarded the Bharat Ratna in 2001. She is known for her melodious voice and has sung thousands of songs in various languages.
- Amitabh Bachchan, the iconic actor, was awarded the Bharat Ratna in 2019. He is one of the most influential and successful actors in the Indian film industry.

Hence, the correct answer is option 'A' - Nanaji Deshmukh.