In the year 1984, how many months began with a Sunday?
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For calendar-based questions:
\begin{itemize}
\item First check whether the given year is a leap year,
\item Use odd days or calendar construction,
\item Remember that leap years shift weekdays by two days.
\end{itemize}
Step 1: The year 1984 is a leap year, as it is divisible by 4.
Step 2: A leap year has 366 days, which means the days of the week shift by 2 days from one year to the next.
Step 3: By constructing the calendar for 1984 or using the odd-days method, it can be determined that 4 months in the year 1984 started on a Sunday.
Step 4: Hence, the correct answer is 4 months.