Mike Owns a Mirror Shop

Mike owns a mirror shop.Abby is building a ballet studio and needs 50 mirrors.On April 1,Abby contracts with Mike to buy 50 mirrors.The mirrors are located at Mike's shop and the contract states that Abby is free to pick-up the mirrors at anytime.Abby pays for the mirrors on April 15 and picks-up the mirrors on May 1.When does the title pass from Mike to Abby?

A) April 1
B) April 15
C) May 1
D) The title does not pass from Mike to Abby.
E) The title passes when Mike identifies the mirrors for Abby.