Answer:
B. challenge; threat
Step-by-step explanation:
As the case says that Heather is focued on the opportunities for promotion and the higher salary the new job will give her instead of worrying about the increased responsabilities, the answer is that she views the new position as a challenge rather than a threat. This because she sees the new job as something good that will require a big effort that will be rewarding for her with a higher salary and she is not thinking on the added reponsabilities as something bad that could cause problems for her.