What chemical, produced by planktonic algae, is the major source of cloud-condensation nuclei over the open oceans?

W) Nitric acid

X) Dimethyl sulphide [dy-METH-uhl SUHL-fyd]

Y) Hydrochloric acid

Z) Sodium carbonate peroxyhydrate [puh-rok-see-HY-drayt]
X) DIMETHYL SULPHIDE