Explanation:

- "The Golden Threshold" is a collection of poems by an Indian author.

- Option 3: Sarojini Naidu is the correct answer. She was an Indian independence activist and poet, known as the "Nightingale of India." She penned this book, which was her first collection of poems.

- Option 1: Dr. Rajendra Prasad was the first President of India, but he wasn't known for writing poetry.

- Option 2: Jawaharlal Nehru was the first Prime Minister of India, and he wrote books on history and politics, but not "The Golden Threshold."

- Option 4: ZA Bhutto was a Pakistani politician and held posts such as Prime Minister, but he didn't author this book.