Which of the Following Events Would Shift a Labor Supply

Which of the following events would shift a labor supply curve? (i)
Immigration of high-skilled workers
(ii)
Immigration of low-skilled workers
(iii)
Changes in the number of women willing to work full time

A) (i) and (iii) only
B) (ii) and (iii) only
C) (iii) only
D) (i) , (ii) , and (iii)