Question

why did the salt march occur?
to protest an unfair british law
to find salt, as it was in short supply
to increase salt exports to european countries
to attempt to shut down the british salt works

Explanation:

The Salt March (Dandi March) was led by Mahatma Gandhi. The British had a law that monopolized salt production and taxed it, making it unfair for Indians. The march was to protest this unjust law, not for salt supply, exports, or shutting works.

Answer:

A. to protest an unfair British law