Choose the correct sentence. a. My father was talking to his friend on mobile phone when I fall from the bicycle.

My father was talking to his friend on mobile phone when I fall from the bicycle.

My father is talking to his friend on mobile phone when I fall from the bicycle

My father was talking to his friend on mobile phone when I fell from the bicycle.

My father was talking to his friend on mobile phone when I am falling from the bicycle.

Explanation

The correct sentence is:

c. My father was talking to his friend on mobile phone when I fell from the bicycle.

This sentence correctly uses the past continuous tense ("was talking") for the ongoing action and the simple past tense ("fell") for the completed action.