IF HE DOESN'T PHONE IMMEDIATELY, HE WON'T GET ANY INFORMATION ABOUT IT

7. If he doesn't phone immediately, he won't get any information about it.

A. Until he doesn't phone immediately, he won't get any information about it.

B. Unless he phones immediately, he will get any information about it.

C. Until he phones, he won't get any information about it.

D. Unless he phones immediately, he won't get any information about it.