Answer:
Option B , Lipid
Explanation:
Sudan III is a dye which is used for testing the presence of non-polar substances.
All fat compounds such as -
oils
waxes
greases
fat emulsions
& other hydrocarbon products
can be tested through Sudan III .
Thus, any substance which is tested for SUDAN III shows negative result , then it simply means that the substance lack fat macro molecules and hydrocarbons
Thus , option B is correct.