You shake up a bottle of vinegar and oil dressing to mix it each time you use it. The reason you need to do this is that:
a) fat molecules are too large to dissolve in water.
b) vinegar and oil are oppositely charged, and opposites attract.
c) vinegar has an acidic pH and is neutralized when mixed with oil.
d) oil is hydrophobic and won't dissolve in vinegar, so the oil and vinegar separate upon standing.

The correct option is (D)

Explanation:

The blending of oil and vinegar delivers a brief blend that will inevitably isolate into two layers. This happens in light of the fact that these two fluids are immiscible, which means it is incomprehensible for these two substances to be blended into a changeless emulsion.   An emulsion is a suspension of two fluids that regularly don't remain blended, similar to oil and vinegar. Typically, on the off chance that one empties oil into vinegar, the oil will glide on the vinegar. Oil is less thick than vinegar. Nonetheless, the fundamental motivation behind why this happens is on the grounds that oil is a non-polar substance, and vinegar is a polar one. Substances with dissimilar sub-atomic structures don't interface no problem at all.