What was the strategic objective of Muhammad bin Tughlaq's Qarachil expedition, and how did it end?

Options:

• A: To conquer Tibet and establish a trade route to China; it ended in a decisive treaty favoring the Sultanate.
• B: To secure the northern frontier against Chinese incursions by establishing control over the Himalayan region; it ended in a military disaster due to hostile climate and terrain.
• C: To annex the kingdom of Kashmir; it ended with the successful integration of Kashmir into the Delhi Sultanate.
• D: To counter the Mongol threat by building a line of forts in the Pamir region; it ended due to a sudden rebellion in Bengal.

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