Extrusive movements ideally would produce no areas of compression within PDL, but will produce:: (A) Only contusion, (B) Only tension, (C) Only retraction, (D) Only extraction
Answer is B. Extrusion is defined as the axial movement of the tooth along the long axis towards the coronal part. 
Features of Extrusion:

Force required: 35–60 g
Loading pattern: No areas of compression in PDL.

Only stretched areas/tension.