Answer:
The correct answer is option B. Brenda was unable to make time for Johanna to brief her on the tasks involved in carrying out the campaign's media strategy.
Step-by-step explanation:
Among all other choices given the best answer would be option B as if Brenda was not available to brief Johanna on the tasks involved in carrying out the media strategy for campaign, and if true it weakens the Brenda's statement about the Johanna.
As Brenda is manager of Johanna its her job to explains and brief about the tasks her trainee or junior need to carry out.
Thus, the correct answer is - option B.