The correct answer is (a) 6th Sept., 1932.
Nagendra Saklani was a freedom fighter who was martyred on 6th September 1932 during the Quit India Movement. He was born in 1911 in the village of Saklana in Garhwal, Uttarakhand. He was educated at the Government Inter College in Srinagar, Garhwal. He joined the freedom struggle in 1930 and was arrested several times. He was finally martyred on 6th September 1932 while leading a procession in Srinagar, Garhwal.
The other options are incorrect. Option (b), 9th June, 1930, is the date on which Mahatma Gandhi launched the Non-Cooperation Movement. Option (c), 11th January, 1948, is the date on which Mahatma Gandhi was assassinated. Option (d), 23rd April, 1930, is the date on which the Salt March was launched by Mahatma Gandhi.