The correct option is: cent - penny coin, sent - past form of send, scent - fragrance.

Here's why:

• Cent: It refers to a one-hundredth part of a dollar or other decimal currency units, like a penny in the US.
• Sent: It is the past participle of the verb "send," meaning to dispatch or cause something to go somewhere.
• Scent: It refers to a distinctive smell or odor, particularly a pleasant one.