Your project requires the integrating with a 3rd party PIM for importing master catalog, two storefront catalogs and pricebooks. All imports need to happen in a single job. Search indexes will also need to be re-built.

Your project requires the integrating with a 3rd party PIM for importing master catalog, two storefront catalogs and pricebooks. All imports need to happen in a single job. Search indexes will also need to be re-built.
A . Two flows are needed. First flow will execute in parallel under organization scope the master catalog import and then the storefront catalogs and on the other hand in parallel the pricebooks imports. Then new flow will be needed with site scope to perform site reindex.
B . Two flows are needed. First flow will execute in parallel under site scope the master catalog import and then the storefront catalogs and on the other hand in parallel the pricebooks imports. Then new flow will be needed with site scope to perform site reindex.
C . Three flows are needed. First to import master and storefront catalogs (organization scope). Another job flow with site scope to import pricebooks and another to perform site reindex under site scope.
D . Two flows are needed. First will execute in parallel under organization scope the master catalog import and then the other flow with storefront catalog import and pricebooks (sequential) organization scope. The second flow will be needed with site scope to perform site reindex.

Answer: A