Concept:
Different synthetic polymers are used for different practical purposes.
Buna-N is a synthetic rubber with good resistance to abrasion and oils, so it is used in products like shoe soles.
ip
Step 1: Recall the common uses of the polymers.
• Polyacrylamide is used in water treatment and related applications.
• Perspex is acrylic plastic used as glass substitute.
• Glyptal is used in paints and varnishes.
• Buna-N is a synthetic rubber used in articles like shoe soles and conveyor belts.
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Step 2: Identify the correct polymer.
Thus, the polymer used for preparing shoe soles is:
\[
\text{Buna-N}
\]
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Hence, the correct answer is:
\[
\boxed{(C)\ \text{Buna-N}}
\]