Step 1: Understanding the Concept:
Government revenue is broadly classified into Tax Revenue and Non-Tax Revenue.
\begin{itemize}
\item Tax Revenue: Compulsory payments levied by the government on individuals and corporations. Examples include income tax, corporate tax, GST, customs duties (import/export), and excise duty.
\item Non-Tax Revenue: Revenue earned by the government from sources other than taxes. Examples include fees, fines, profits from public sector undertakings (PSUs), and interest receipts.
\end{itemize}
Step 2: Detailed Explanation:
Let's analyze the given options:
\begin{itemize}
\item (A) Export duty: This is a tax on goods exported from the country. It is tax revenue.
\item (B) Import duty: This is a tax on goods imported into the country (a type of customs duty). It is tax revenue.
\item (D) Excise duty: This is a tax on the manufacture of goods within the country. It is tax revenue.
\item (C) Dividends: This is the share of profit that the government receives from its investments in Public Sector Undertakings (PSUs) and other companies. This is a form of profit, not a tax.
\end{itemize}
Step 3: Final Answer:
Dividends represent income from government investments and are a source of non-tax revenue. The other options are all types of taxes. Therefore, option (C) is the correct answer.