The shortcut used for Sales Order is

1. Option A: Alt + F4
Alt + F4 is used to close the application window. It is not related to Sales Order.

2. Option B: Alt + F5
Alt + F5 is used for Payment vouchers in Tally. It is not the correct shortcut for Sales Order.

3. Option C: Alt + F7
Alt + F7 is the correct shortcut for creating a Sales Order in Tally.

4. Option D: Alt + F8
Alt + F8 is used for Delivery Notes in Tally, not for Sales Order.

Therefore, the correct answer is Option C: Alt + F7, as it is specifically designed for the Sales Order function in Tally.