Question-1 : Resource limitations are considered during develop schedule and are part of a.Resource calendars b.Critical path method c. schedule network analysis d. resource levelling.

I selected answer D, but it's telling answer B

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Question-2 : You are a project manager making a big bridge on river that has 100 pillars. the cost of the mega project is USD 6,000,000. The project is scheduled for 12 months. You are supposed to spend USD 500,000 every month. After 6 months, you determine that only $ 3,000,000 of work is completed and cost incurred is $ 4,000,000. what is the ETC. a. USD 2,000,000 b.usd 1,200,000 c.usd 1,000,000 d. usd 3,000,000

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Question-3: You are a project manager and you had a task that was supposed to be done by 2 resources in 2 weeks. one of your assigned resource has to take emergency medical leave for these 2 weeks and there was no way left for you to find his replacement. At the end of 2 weeks, the person assigned to the task completed 75% of the work. what is the cost performance index ? a. 1.15 b. -0.8 c. -0.9 d. 1.0

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Quetsion -4 : Your subcontractor delivered building raw material 3 days late. To bring some degree of sathisfaction, he reduced it's cost by 5% . this offer is an example of a. compromise b.collaborate c. smoothing d. forcing. I guess it's smoothing.. please clarify

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Question-5: You are a project manager invloved in pest control task. In one of teh human populated area, you have applied mosquito pest control to kill mosquitoes. however the pest odor is going to trouble people living in this area for few days. what best describe this form of risk management. a. Unidentifiable risk b. Residual risks c. secondary risk d. accepted risk . I selected answer c. secondary risk. But the answer is given as residual risk . Please clarify.
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I am waiting for the experts to clarify on the above 5 questions.