Universal Container’s CEO is planning for next year and wants to get more information on the revenue trends month over month. Which report does she need to build to meet her requirement?

Answer options:

A.Tabular
B.Summary
C.Summary and Tabular
D.Matrix

Correct Answer: D 
Matrix reports give you the ability to group data by row and column. It provides the data at a glance with the most detailed view. 
Option A is incorrect because in the tabular report you cannot group the data. 
Option B is incorrect because in summary report you can create any group of data. It provides more option to organize the data, but you cannot view the data at a glance. 
Option C is incorrect because you can’t create Summary and Tabular reports grouped together. 
Reference: 

https://help.salesforce.com/articleView?id=reports_changing_format.htm&type=5