In a transistor operates at the middle of the load line, an increase in the base resistance will move the Q point A. down B. up C. nowhere D. off the load line E. None of the above

The correct answer is: A. down.

An increase in base resistance will decrease the current through the base-emitter junction, which will decrease the collector current. This will cause the Q point to move down the load line.

Option B is incorrect because an increase in base resistance will decrease the collector current, not increase it.

Option C is incorrect because the Q point will move, not stay in the same place.

Option D is incorrect because the Q point will move along the load line, not off of it.

Option E is incorrect because the answer is A.