Linseed oil is used in paints as A. Thinner B. Vehicle C. Base D. Drier

The correct answer is: B. Vehicle

Linseed oil is a drying oil that is used in paints as a vehicle. A vehicle is a liquid that carries the pigment and binder in a paint. Linseed oil is a good vehicle because it is slow-drying, which allows the painter to work with the paint for a longer period of time. It is also a good binder, which helps the paint to adhere to the surface.

The other options are incorrect because:

• A thinner is a liquid that is used to reduce the viscosity of a paint. Linseed oil is already a relatively thin liquid, so it does not need to be thinned.
• A base is the foundation of a paint. Linseed oil is not a base, but it can be used to make a base for a paint.
• A drier is a substance that is added to a paint to speed up the drying process. Linseed oil is a drying oil, so it does not need to have a drier added to it.