The graph below shows the total accumulated dollars (in millions) spent by the Surf City government during $1988$.  For example, about $.5$ million had been spent by the beginning of February and approximately $2$ million by the end of April.  Approximately how many millions of dollars were spent during the summer months of June, July, and August?


$\text{(A)}\ 1.5 \qquad \text{(B)}\ 2.5 \qquad \text{(C)}\ 3.5 \qquad \text{(D)}\ 4.5 \qquad \text{(E)}\ 5.5$
Since we want to know how much money is spent in June, July and August, we need the [difference](https://artofproblemsolving.com/wiki/index.php/Difference) between the amount of money spent by the beginning of June and the amount of money spent by the end of August.  
We estimate these to be about $2.2$ million and $4.8$ million, respectively.  The difference is
\[4.8-2.2=2.6\approx 2.5 \rightarrow \boxed{\text{B}}\]