(A) Error: attend | Correction: attends
The subject 'Mohini' is singular, so the verb must be in third-person singular present tense: attends.
Subject-verb agreement rule: singular subjects take verbs with '-s' in simple present tense. 'Attend' is the base form used for plural subjects or I/you; 'attends' is correct for he/she/it (singular third person).