Fill the blank with correct option
I saw her _____ your cupboard.

Options

A. i) to opening
B. ii) opened
C. iii) opening
D. iv) to open

Explanation

opening
We use the -ing form after the object of verbs such as hear, see, notice, watch. The -ing form usually emphasizes an action or event which is in progress or not yet completed.
In this sentence, the action “opening the cupboard” was in progress