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An airfoil is a streamlined body as shown in the figure below. Because of the streamlining of the body, the separation occurs only at the extreme rear of the body, resulting in

An airfoil is a streamlined body as shown in the figure below. Because of the streamlining of the body, the separation occurs only at the extreme rear of the body, resulting in Correct Answer A small wake and consequently small pressure drag 

Concept:

Wake region:

When a fluid separates from a body, it forms a separated region between the body and the fluid stream. This low-pressure region behind the body where recirculating and backflows occur is called the separated region. The larger the separated region, the larger the pressure drag.

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Explanation:

 

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The airfoil in the given figure is a streamlined body, thus the formation of wake region is in very less area. Thus the region of low pressure is not formed, and the pressure difference created is also very less. Hence pressure drag is in very small quantity.

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