ISI marked goods are always pure.

A. clear

B. fresh

C. unmixed

D. clean

Answer: Option C

Solution(By Examveda Team)

Clear : easy to perceive, understand, or interpret.
Fresh : (of food) recently made or obtained; not tinned, frozen, or otherwise preserved.
Unmixed : not mixed.
Clean : free from dirt, marks, or stains.
Pure : not mixed or adulterated with any other substance or material.

Synonym of Pure is Unmixed