The correctly punctuated sentence is (d)
Answer:
The answer is below
Explanation:
Research problems are more likely to be derived from circumstances that convey a sense of difficulty because it is during this period or situation there exist needs to solve such difficulty.
The human drive to solve problems increases when there is a sense of difficulty, especially the circumstances affecting people generally.
For example, in an emerging field or novel situation involving difficulty like this period of coronavirus, there is an increase in carrying out more research problems to solve the difficulty.
The best answer would be D, because the other three are not as sophisticated. When writing in an academic voice, you need to use precise words as to sound more scholarly. I hope this helps!
Both excerpts use the words of those affected to help support the idea!