Right answer is (b) Disintegration rate
To elaborate: Important physicochemical factor that has effect on the renal excretion are molecular size, pKa of the drug, and lipid solubility. A small molecular sized compound can easily get filtered out by the glomerulus. Compounds of eight below 300 Dalton and water soluble, can get readily excreted by glomerulus. Disintegration rate does not affect the excretion, it will affect absorption.