Which detail from "Object Lesson, Part 1" supports the prediction that Ellery Queen will find the missing money before first period ends? Three of the boys' faces were rather too elaborately blank. The door only opened and closed when Mrs. Morell left. Ellery Queen is hearing testimony from the students. The lock on Miss Carpenter's locker does not work.

The correct option is 4. The lock on Miss Carpenter's locker does not work.

Explanation:

The name of the three boys who Ellery Queen thought to be thieves or suspects of the crime were Howard Ruffo, David Strager, or Joey Buell. She thought these boys might have stolen the money because they were seen running outside a bakery. These boys are students of Henry Hudson High School. By the end of Part 1, Miss carpenter has deep respect for Ellery Queen.  The police had not reached to any conclusion regarding who stole the money.

What chapter explain.