Mahatma Gandhi's Salt March was notable as the first nationlist activity focused on

The correct answer is:

(B) Lord Irwin (British Salt Law)

Mahatma Gandhi's Salt March, which began on March 12, 1930, was a nationalist movement focused on protesting the British Salt Law, specifically the salt tax imposed by Lord Irwin, the Viceroy of India.

Objectives:

1. Challenge British monopoly on salt production.
2. Protest salt tax, affecting India's poor.
3. Disobey unjust law through non-violent resistance.

Key events:

1. March 12, 1930: Gandhi began walking from Sabarmati Ashram to Dandi.
2. April 6, 1930: Gandhi reached Dandi, broke salt law by producing salt.
3. Nationwide protests, civil disobedience followed.

Lord Irwin's response:

1. Refused to repeal salt law.
2. Imprisoned Gandhi, other leaders.
3. Sparked widespread protests, strengthening Indian independence movement.