According to the following site
https://developer.salesforce.com/docs/atlas.en-us.object_reference.meta/object_reference/sforce_api_objects_list.htm
For Sure C is correct (it is not a standard object).
However, "Solution" is among the list of Salesforce Standard Objects.
https://developer.salesforce.com/docs/atlas.en-us.object_reference.meta/object_reference/sforce_api_objects_solution.htm
Job Applicants are not standard objects.
In a database or software application, an object is a collection of data and the methods or functions that operate on that data. Standard objects are pre-defined objects that are included in the database or application by default, and are typically used to store and manage common types of data.
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