Select the correct match for $X$ and $Y$:

Column $X$	Column $Y$
$(1)$ Skin color	$(P)$ Immunoglobulin
$(2)$ Immunity	$(Q)$ $Mg^{+2}$ containing protein
$(3)$ Movement	$(R)$ Melanin
$(4)$ Exoskeleton	$(S)$ Protein with four heme groups
$(5)$ Photosynthesis	$(T)$ Keratin
$(6)$ Transport of respiratory gases	$(U)$ Globular protein

• A
  $(1-T), (2-U), (3-R), (4-Q), (5-S), (6-P)$
• B
  $(1-R), (2-P), (3-U), (4-T), (5-Q), (6-S)$
• C
  $(1-Q), (2-P), (3-S), (4-R), (5-U), (6-T)$
• D
  $(1-T), (2-U), (3-S), (4-R), (5-Q), (6-P)$