A polynomial of degree three, which is a cubic polynomial, can have exactly three zeroes. These zeroes could be real or complex, and they may or may not be distinct.
Step 2: Analyzing the options.
\begin{itemize}
\item (A) Only one zero: Incorrect. A cubic polynomial cannot have just one zero. It has exactly three, though some of them might be repeated.
\item (B) Exactly three zeroes: Correct. A cubic polynomial always has exactly three zeroes.
\item (C) Almost three zeroes: Incorrect. A cubic polynomial has exactly three zeroes, not "almost" three.
\item (D) More than three zeroes: Incorrect. A cubic polynomial can have at most three zeroes.
\end{itemize}
Step 3: Conclusion.
Therefore, the correct answer is (B) Exactly three zeroes.
Final Answer:} Exactly three zeroes.