Juan organizes the stamps in his collection by country and by the decade in which they were issued. The prices he paid for them at a stamp shop were: Brazil and France, 6 \phi each, Peru 4 \phi each, and
Number of Stamps by Decade
\begin{array}{|c|c|c|c|c|}
\hline
\textbf{Country} & \textbf{'50s} & \textbf{'60s} & \textbf{'70s} & \textbf{'80s} \\
\hline
\text{Brazil} & 4 & 7 & 12 & 8 \\
\hline
\text{France} & 8 & 4 & 12 & 15 \\
\hline
\text{Peru} & 6 & 4 & 6 & 10 \\
\hline
\text{Spain} & 3 & 9 & 13 & 9 \\
\hline
\end{array}
Juan’s Stamp Collection Spain 5 \$ each. (Brazil and Peru are South American countries and France and Spain are in Europe.) The average price of his '70s stamps is closest to
Answer Choices
A. 3.5 ф
B. 4 \notin
C. 4.5 \phi
D. 5 申
E. 5.5 申