The compound that is white in color is

Lead sulphate-white

Lead sulphate is a white, somewhat crystalline, very heavy powder, its specific gravity being about $6.3$. It is only slightly soluble in water, insoluble in dilute acids and alcohol, but soluble in solutions of ammonium salts and strong sulphuric acid.

Ammonium sulphide-soluble

Lead iodide-bright yellow

Ammonium arsinomolybdate-yellow

Hence, the answer is option B.