Answer:
C.) Tears welled in my eyes while I was watching the movie.
Step-by-step explanation:
A dangling modifier is a word or phrase that doesn´t modify the word intended to modify. They are commonly regarded as grammatical errors. One way to correct it is by adding a noun phrase that the dangling modifiers can logically describe.
In the question given, the dangling modifier is "Watching the movie".
I hope this answer helps you.