Which sentence implies that something may not happen?
if i can sing well enough, i'll join the school chorus.
i didn't meet the requirements, so i can't apply for that scholarship.
why can't you go to the game tonight?
you have a tough decision to make.

The correct answer is if i can sing well enough. The other options are already decided, as in they have an answer.

a. is the correct answer

the correct answers are:

c. “never in the history of his people had a man married a woman who spoke a different tongue.”

d. “‘it has never been heard,’ was the verdict of an old man speaking a few weeks later.”

e. “this man had come with others to commiserate with okeke.”