Keanu delivers an instrument to Laura that states 'pay to the order of Laura'. Laura then presents the instrument to MegaBank for payment. This instrument is the most common type of negotiable instrument, which is a certificate of deposit.

A. a check.

B. a note

C. a payment via a mobile device.

Keanu delivers a A. Check to Laura.

Explanation:

A check is a type of payment; it is a document, or instrument which is written, signed and has the date and amount of money one individual will give to another one. It can be deposited or cashed.

The bearer of the check proceeds to the bank and the sum of money presented on it will be shifted to his/her bank account.

In this case, Keanu delivers an instrument which states that Laura needs to be payed; she presents this instrument, a check, to get her payment.

A note is not a valid form of payment and a payment via mobile device does not require Laura to present the instrument to the bank.