Both a and b are correct depending on context.

Topic: future tense Both a and b are correct, it depends on the tense been used.

I can't click on just ONE because TWO are correct. Am I supposed to click the one that is WRONG? I'll try clicking on the wrong one to see what happens.

Is Coming and Will Come are both fine.

No. Clicking the one wrong one tells me I am wrong (perhaps obviously!). But I don't seem to be able to click on the two that are right. How do you do this quiz question?