Answer:
C. whether the president is too unemotional
Explanation:
What best states the primary issue discussed in the passage is whether the president is too unemotional.
As discussed is the passage "The president's basic problem, in my opinion, is that she is too unemotional. She makes all her decisions on cold logic and seems to ignore the human dimension" and also the proof claimed she has in respect of the way she withdrew her support for her brother-in-law when he was charged with tax evasion.
All this sum the primary issue discussed in the passage as whether the president is too unemotional.