What does 'alacrity' mean in the context of accepting an invitation?

The term 'alacrity' denotes a sense of brisk and cheerful readiness when responding to a request or invitation. In this context, if someone accepts an invitation with alacrity, it means they do so with enthusiasm and eagerness, suggesting a positive attitude towards the invitation. This aligns perfectly with the notion of being ready and willing to participate joyfully.

Other terms around the choices can indicate different attitudes or feelings towards accepting invitations, such as reluctance or indifference, which do not capture the essence of alacrity. Calmness under pressure is also unrelated, as it pertains more to an individual's composure rather than their eagerness or enthusiasm in social situations. Thus, the correct association of 'alacrity' with lively and prompt readiness makes it the most appropriate option.