Step 1: Understanding the Concept:
Phulkari is the folk embroidery of Punjab. The word means 'flower work'. The question asks which base fabric was traditionally used for it.
Step 2: Key Facts:
Traditionally, Phulkari was worked on khaddar, a coarse hand-spun and hand-woven cotton cloth.
The cloth was often dyed in red, brown, blue or black.
The embroidery is done with untwisted silk floss (pat) in darning stitch from the back of the cloth.
The coarse, evenly woven khaddar lets the worker count threads to make geometric patterns.
Step 3: Why the other options are wrong.
Muslin is a very fine, sheer cloth. It is too delicate for the heavy darning stitch of Phulkari.
Wool is not the usual base for Phulkari. It is the base for other craft forms.
Linen is not a traditional Punjabi base fabric for this embroidery.
Final Answer:
Khaddar was traditionally used as the base for Phulkari. This is option (A).