Final answer:
Analytical reports are more challenging to write than informational reports because they require more research, involve complex data interpretation, and focus on analysis rather than presenting facts. Therefore the correct answer is a) Analytical reports require more detailed research and data analysis.
Step-by-step explanation:
Analytical reports are more challenging to write than informational reports because they require more detailed research and data analysis, involve complex data interpretation, and focus on drawing conclusions and providing analysis rather than presenting facts without analysis. Analytical reports often require gathering information through research and conducting primary research, such as experiments or surveys. They also require writers to take an objective stance and use statistical evidence to support their analyses.