1) American put option price increase if time to expiration gets extended.

True

or

False

2) American put option price increase if risk free rate increases.

True

or

False

3) American put option price increase if volatility of underlying stock price goes down.

True

or

False

4) For a non dividend paying underlying stocks, american call option can be more expensive than European call option that are equal in other terms.

true

or

False