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Welcome to the CPL Meteorology question and answer forum. Please feel free to post your questions but more importantly also suggest answers for your forum colleagues. Bob himself or one of the other tutors will get to your question as soon as we can.
The answer I would consider correct is (e). The polar jet stream is the result of the difference in height of the tropopause in the mid-latitude cell and the polar cell. This produces a significant pressure differential between the two cells at those levels. The resulting outflow from the mid-latitude cell to the polar cell, combined with the Coriolis effect due to the earth's rotation produces very strong westerly winds in that latitude band.