Which of the the following is the most important part of your personal interior decorating portfolio?
a) before and after photographs
b) color chips
c) swatches of fabrics
d) floor plans

Option C.

Explanation:

Swatches of fabrics , is the right answer.

A piece of fabric or cloth intended to signify a greater whole is known as a textile sample. A tiny sample, generally obtained from existing cloth, is described as a swatch, whilst a bigger sample, presented as a trial to examine printmaking processes, is described as a strike off. One of the most important parts of the personal interior decorating portfolio is the swatches of fabrics.

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i hope this your understandings.