State F$$s statute provided an annual $$500$ property tax exemption for widows $($women$)$ without providing any comparable exemption for widowers $($men$).$ This statute was designed to further state policy of reducing the disparity between the economic capabilities of a man and woman.$$ Which of the following would State F$$s statute most likely violate?

a$.$ Equal Protection Clause

b$.$ Commerce Clause

c$.$ Supremacy Clause

d$.$ Due Process Clause