The correct options are
C Polycot
D Terrywool
The process of combining two or more fibres to produce a fabric with better characteristics is called blending. Synthetic fibres are generally blended with natural fibres to obtain a fabric that has the characteristics of both of them.
Amongst the given fabrics, polycot (polyester + cotton) and terrywool (terrylene + wool) are blended fabrics whereas terrylene and polyester are synthetic fibres.