On January 1, 2014 the country of Wespro passed the following laws:

Section 1: Effective July 1, 2014, anyone who wears green socks is guilty of a crime for which he or she shall be imprisoned for two years.

Section 2: Effective immediately, everyone must wear red socks on even numbered days of the month

Section 3: Effective immediately, everyone must go without socks on Sundays

Section 4: "Socks" include, in addition to its regular meaning, any woven covering of the feet.

Which section is an example of an ex post facto provision?

A. Section 1

B. Section 2

C. Section 3

D. Section 4

E. none of the sections represents ex post facto legislation.