Question

What is the correct way to tell your grandfather to buy the book?

Question 27 options:

Kaufen Sie das Buch!


Kaufen du das Buch!


Kaufst du das Buch!


Kaufen das Buch!

Answer 1

The third one is incorrect (sorry I'm not that good at this) hope i help eliminate tho

Answer 2

The right answer would be the third option.
Most likely you will talk to your grandfather informal, familiar.

Kaufst Du das Buch?