Why was Rohtang Pass important in the pastoral economy of the Gaddis?

Correct answer: It was a route to reach high summer pastures

The direct answer is A: Rohtang Pass was a route to the high summer pastures used by the Gaddis. Mountain pastoralists moved seasonally because different altitudes supplied suitable grazing at different times. Step by step, warmer months made higher mountain meadows accessible; the Gaddis crossed the pass with their herds; they used those high pastures for summer grazing and later moved according to seasonal conditions. Option A is correct because it connects the pass with access to summer pasture. Option B is wrong because Rohtang is a mountain pass, not a sea-trade port. Option C is wrong because its importance was pastoral and geographical, not cloth production. Option D is less accurate and does not explain why the Gaddis used it; it was not simply a boundary of settled farming. Memory cue: mountain pass plus Gaddis means seasonal access to high grazing.