Your new application requires an analytical data store. The following are the primary considerations. 
-> Primary database model should be relational 
-> SQL language support 
-> Supports Query Scale out 
-> Row level security must be supported 
Is Azure Data Explorer suitable for this?

Answer options:

A.Yes
B.No

Correct Answer: B
 Azure Data Explorer is a relational data store. It supports SQL language and query scale out. But when it comes to the Row Level Security capability, it lacks the capability. 
A better choice here will be the Azure Synapse SQL pool. 
Reference: To know more, please refer to the docs below: 

https://docs.microsoft.com/en-us/azure/architecture/data-guide/technology-choices/analytical-data-stores