The bearing of the runway at threshold is 290°, the runway number is A. N 70° W B. 290° C. 29° D. W 20° N

The correct answer is A. N 70° W.

The bearing of a runway is the direction from true north to the centerline of the runway, measured clockwise from north. A bearing of 290° is equivalent to a direction of 290° from true north, or 70° west of north. Therefore, the runway number is N 70° W.

Option B is incorrect because it is the bearing of the runway from the threshold to the centerline, not from true north. Option C is incorrect because it is the bearing of the runway from the centerline to the threshold,