Examples of polyploid crops:
\[
\boxed{
\begin{aligned}
\text{Wheat} &\rightarrow 6n
\text{Potato} &\rightarrow 4n
\text{Banana} &\rightarrow 3n
\end{aligned}
}
\]
Polyploidy is much more common in plants than in animals.
Step 1: Recall polyploidy.
Polyploidy is the condition in which an organism possesses more than two complete sets of chromosomes.
It is commonly found in plants.
Step 2: Identify the polyploid organism.
Bread wheat (Triticum aestivum) is a
\[
\boxed{\text{Hexaploid }(6n)}
\]
plant.
Hence,
\[
\boxed{\text{Wheat}}
\]
is the correct answer.
Therefore,
\[
\boxed{(C)}
\]
is the correct answer.