Which of the Following Statements About Orbital Symmetry and Cycloaddition $\pi$

Which of the following statements about orbital symmetry and cycloaddition reactions is true?

A) Thermal cycloadditions involving an even number of $\pi$ bonds proceed by a suprafacial pathway.
B) Thermal cycloadditions involving an odd number of $\pi$ bonds proceed by a suprafacial pathway.
C) Photochemical cycloadditions involving an odd number of $\pi$ bonds proceed by a suprafacial pathway.
D) Photochemical sycloadditions involving an even number of $\pi$ bonds proceed by an antarafacial pathway.