A. leaking in at least a dozen places, the campers abandoned those tents and moved to the dry, warm cabin. b. the tents, leaking in at least a dozen places, were abandoned by the campers who were lured by the dry, warm cabin. c. the tents were abandoned as the campers, moved to the dry, warm cabin, leaking in at least a dozen places. d. the campers, leaking in at least a dozen places, abandoned their tents for the dry, warm cabin

The correct answer is B. The tents​, leaking in at least a dozen​ places, were abandoned by the campers who were lured by the​ dry, warm cabin.
This is the only sentences that places the modifier leaking in at least a dozen places correctly.
A and D are incorrect because the way those two sentences are written, it would seem that the campers, and not the tents, were leaking. C is also incorrect because it seems that the warm cabins are leaking, when in fact the tents were. So B is the only correct answer.

Explanation:

Initial velocity = u = 20 km/hr = 20 * 5/18 = 5.56 m/s. Time period = 10 sec