Explanation:

- Option 1: Madame Bhikaji Cama

- Madame Bhikaji Cama was a prominent Indian independence activist who is often credited with unfurling an early version of the Indian flag in 1907. However, she is not the designer of the Indian National Tricolour that India adopted in 1947.

- Option 2: Bankim Chandra Chattopadhyay

- Bankim Chandra Chattopadhyay was a famous Indian writer and poet, best known for his work 'Vande Mataram', which became a national song. He was not involved in designing the Indian flag.

- Option 3: Pingali Venkayya

- Correct Answer: Pingali Venkayya was indeed the designer of the Indian National Tricolour. In 1921, he presented the flag design that eventually evolved into what became the official flag of India in 1947.

- Option 4: Annie Besant

- Annie Besant was a prominent British socialist and supporter of Indian self-rule. She played a role in the Indian independence movement, including co-founding the Home Rule League, but she did not design the Indian flag.