<span style="background-color:#ffffff;color:#222222;">A: Have you got time on Friday?</span><br style="background-color:#ffffff;color:#222222;"/><span style="background-color:#ffffff;color:#222222;">B: Why? I will sstay at home,</span><br style="background-color:#ffffff;color:#222222;"/><br style="background-color:#ffffff;color:#222222;"/><span style="background-color:#ffffff;color:#222222;">Is "Why?" used correct here? If so, what does it mean?</span>