On a map consisting of unit squares where each unit square has an area of $1 \mathrm{~km}^{2}$, the locations of villages $\mathrm{A}$, $\mathrm{B}$, $\mathrm{C}$, $\mathrm{D}$ and $\mathrm{E}$ are shown as in the figure.
A helicopter located at point O has enough fuel to fly 4 kilometers.
Which of the following is the farthest village that this helicopter can reach?
A) A\\
B) B\\
C) C\\
D) D\\
E) E