Final answer:
The correct pronoun that completes the subjunctive sentence is 'elle'.
Step-by-step explanation:
The correct pronoun that completes the subjunctive sentence is elle.
When using the verb 'falloir' in the third person singular form (il faut), we need to match the following verb in the subjunctive mood to agree with the subject. In this case, the subject is 'elle' (she), so the correct pronoun is 'elle'.
The correct sentence would be: Il faut qu'elle émette un chèque barré pour payer le loyer.
Learn more about French Pronouns