just need to determine if its descriptive or inferential, just want a check please.

A report by a satelite team said each satellite is orbiting earth and a number of years each has been in service.
descriptive.

b. a research service has samples obtained from food and a variety of other sources and measured the total capacity in each sample. they used the resulting data to suggest that eating a certain food could prevent cancer.
inferential.

c. the government office issued a report listing every company that was granted a patent in 2009 and the number of patents given to each company.
descriptive.

d. there was a researcher a a university that used scans to identify medication to help treast characterized disorders.
inferential.

please check these please, also, if there are any keywords to look for in the deciding factor for future problems.

thanks alot.