In many of van goghâs paintings, the thick application of paint with each brush stroke is an example of:

Impasto is a technique used in painting, where paint is laid on an area of the surface in very thick layers,usually thick enough that the brush or painting-knife strokes are visible. Paint can also be mixed right on the canvas. When dry, impasto provides texture; the paint appears to be coming out of the canvas.

Seen this the answer is d : )

Its the 3rd one i think