Identify the grammatically incorrect sentence or sentences among the following: a. I helped the Polio vaccine for the children. b. I would give a lump of sugar to each child. c. The health assistant would squeeze a drop of the solution into each lump. d. Then I checked if the children had all swallowed.

Which Indian independence movement leader was primarily known for his philosophy and practice of non-violent civil disobedience?

Who gave the call for 'Do or Die' during the Quit India Movement in 1942?

Which of the following revolutionary pairs were imprisoned together in Cellular Jail and faced harsh conditions, contributing significantly to the Indian independence movement?