To complete the application successfully, ______ all supporting documents must be uploaded before the deadline.
Which choice completes the text so that it conforms to the conventions of Standard English?
- A
ensuring that
- Bcheck_circle
applicants must ensure
- C
the system requires that
- D
it is necessary that
Explanation
The infinitive phrase "To complete the application" needs a subject capable of completing it. "Applicants must ensure" supplies that agent.