a challenge of/for

[jasonlulu_2000]

--How amazing it is thatastronauts are exploring outer space! Ks5u
---It’s a challenge_______ man against nature.

A. of B. for

Which one is better? WHY?



Thanks

[billmcd]

--How amazing it is thatastronauts are exploring outer space! Ks5u
---It’s a challenge man against nature.

A. of B. for

Which one is better? WHY?



Thanks

As usual context would determine choice, but use of "for" would be a focus on man's challenge, whereas "of" would focus on the broader issue of the challenge. A trivial differance that would go unnoticed in actual use.

[jasonlulu_2000]

Sorry, I am still puzzled over your explanation.

Can you give me an example?

Anyway, thanks.

Jason