Choose the option nearest in meaning to the word underlined. His discovery of the vaccine became a quantum leap in search for a scientific cure for the illness.

Choose the option nearest in meaning to the word underlined.

His discovery of the vaccine became a quantum leap in search for a scientific cure for the illness.

A victorious battle
B slow but steady step
C great impovement
D fast but sure step

jamb 2006 english-language

The correct answer is C. great impovement

Quantum Leap: a huge, often sudden, increase or advance in something.

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