What Is the Principal Difference Between Traditional Sound Effects and Foley

What is the principal difference between traditional sound effects and Foley sounds?

A) Traditional sound effects are unique; Foley sounds can be taken from a prerecorded library.
B) Traditional sound effects are created and recorded "wild"; Foley sounds are recorded in sync with the picture.
C) Traditional sound effects call attention to their own artificiality; Foley sounds enhance verisimilitude.
D) Traditional sound effects rely on a variety of props to simulate everyday sounds; Foley sounds are recorded from the natural sounds of real things.
E) Traditional sound effects exaggerate reality; Foley sounds are naturalistic.