Below are given squares $\mathrm { ABCD }$, $\mathrm { BLPR }$, and KLMN with side lengths of 3, 2, and 1 units respectively.
In the figure, points $\mathrm { A }$, $\mathrm { B }$, $\mathrm { K }$, and L are collinear.\
Accordingly, what is the area of triangle DNP in square units?\
A) 3\
B) 4\
C) 5\
D) 6\
E) 8