Correct Answer: zeal

Solution : The correct choice is the first option .

Enthusiasm refers to a strong and eager interest or passion for something. Zeal is a synonym that conveys a similar sense of intense enthusiasm or fervour.

The meanings of the other options are as follows:

• Calmness : The state or quality of being free from agitation or strong emotion; tranquilly.
• Curiosity : A strong desire to know or learn something; an interest leading to inquiry.
• Anxiety : A feeling of worry, nervousness, or unease about something with an uncertain outcome; often related to fear about future events.