Choose the correct option to complete the sentence.
She couldn't help but __________ up during an emotional scene in the movie.

Correct option is A

The correct option to fill in the blank is (a) tear.
Explanation: The phrasal verb tear up means “to begin to cry; to have eyes fill with tears.” The idiom “couldn’t help but + base verb” takes the base form (tear), not the past (tore) or a noun. (Hindi: tear up = आँखों में आँसू आ जाना/रो पड़ना.)
Example: He teared up when he heard the news.
Why other options are incorrect:
· (b) tier — noun meaning a row/level in a structure (Hindi: पंक्ति/स्तर).
· (c) tyre — noun; the rubber covering of a wheel (Hindi: टायर).
· (d) tire — verb to become or make weary (Hindi: थकना/थकाना); doesn’t collocate with up to mean crying.