Select the option that can be used as a one-word substitute for the given group of words.

A loud appeal or demand

Clamour

The correct answer is clamour.

• Protest is a strong complaint expressing disagreement, disapproval, or opposition.
• Entourage is the group of people who travel with and work for an important or famous person.
• Gambit is a risky or clever move in a game or negotiation.

The word clamour comes from the Latin word "clamare," meaning "to shout." A clamour is a loud and confused noise, especially that of people shouting. It can be used to describe a loud appeal or demand, as in the given group of words.