The value of a call option will increase because of:

The value of a call option increases when:

The underlying share price increases

The strike price decreases

The time to expiry increases

Volatility increases

Risk-free rate increases

Looking at the options:

A. Increase in strike price → reduces call value

B. Decrease in volatility → reduces call value

C. Increase in time to expiry → increases call value ✅

D. Decrease in share price → reduces call value

Answer: C. An increase in the time to expiry.