Exam ADM-201 topic 1 question 238 discussion

The default limit is 50, but you may request 300 as a maximum of Active Workflow Rules. You can add additional inactive rules for a total of 500 Workflow rules, and this limit is hard-coded. There is, however, a 2,000 Rules per org maximum. The org limit applies to any combination of workflow, assignment, auto-response, and escalation rules, both active and inactive. This is a hard coded limit that cannot be raised. Additionally,upon raising this limit, there may be a noticeable performance impact every time you save a record, as the system will need to check the record against more rules to see if one applies

(By default) Each object has limit to 50 active Workflows.

https://help.salesforce.com/s/articleView?id=000385653&type=1 => NOTE: Starting in Winter '23 Salesforce will disable the ability to create new Workflow Rules. This is part of the Workflow End of Life process. By default, each object (or entity) is limited to 50 active workflow rules.

so, D is not right, and there is no correct answer

reference for Danny999's response: https://help.salesforce.com/articleView?id=000328439&type=1&mode=1

50 rules