Which word refers to passionate enthusiasm?

• A. Volatile
• B. Whimsical
• C. Zeal
• D. Waver

Answer: (C)

The idea being tested is choosing a word that signals strong, devoted energy for something. Zeal perfectly fits “passionate enthusiasm” because it means great energy, ardor, and eager commitment in pursuing a goal or cause. You can sense that intensity in a sentence like, “Her zeal for the project energized the entire team.” The other options don’t convey that combination of fervor and sustained commitment: volatile means unstable and likely to change quickly; whimsical suggests playful, capricious notions rather than deep, devoted energy; waver is a verb meaning to hesitate or fluctuate, not a noun for enthusiastic drive.