Resins are

Here's a simple explanation of the question and answer choices, made for a beginner:

The question asks: What are Resins?

Let's look at each option:

Option A: Not soluble in water
This is TRUE for most resins. Think of resins as being a bit like very thick, sticky oils. Oils generally don't mix with water.

Option B: Soluble in spirit
This is also TRUE. "Spirit" here means solvents like alcohol. Resins often dissolve well in these types of solvents.

Option C: Used in varnishes
This is TRUE. Varnishes are coatings used to protect wood and give it a shiny finish. Resins are a key ingredient in many varnishes. They provide the protective layer.

Option D: Left behind on evaporation of oil
This is TRUE .Resins are non-volatile so they don't evaporate, they are the solid material left behind .

Therefore, the best answer depends on context and what the question is intended to assess. Because All the options are possible based on the type of resins.