Use the figures to answer the question. 
Which functional group shown in the figure can accept protons and raise the pH of the surrounding solution?
Definitions:
Promissory Note
A financial instrument comprising a written promise by one party to pay a certain amount of money to another party at a specified time or on demand.
Dishonored
A term typically used in banking and finance to refer to a payment instrument, such as a check or promissory note, that has been refused or rejected by the payer's bank due to insufficient funds or other reasons.
Interest-Bearing Note
A debt instrument in which the issuer pays interest to the holder, usually at a fixed rate, until the note reaches maturity.
Interest Revenue
Income earned from lending money or investing in interest-bearing assets.
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