Question

Q7. Choose the correct sentence.
Molly goes to her office on feet
Molly goes to her office on foot.
Molly goes to her office by feet.
Molly goes to her office by foot​

Answer 1

Choose the correct sentence - Molly goes to her office on foot.

Explanation:

• The preposition ON is used in the places of movement and actions involving body parts.

• For example:  

1. I pray on my knees.
2. Lie on your back.
3. The ring is on my finger.
4. She has tattoos on her arms.

• The preposition "by" is used in the "method of transportation." For example, by car, by train, by bus, and so on.

• So the correct sentence is, "Molly goes to her office on foot."

Answer 2

Molly goes to her office on foot.

hope it helps !!