The simplest form of the expression $$\frac{{{p^2} - p}}{{2{p^3} + {p^2}}}$$+ $$\frac{{{p^2} - 1}}{{{p^2} + 3p}}$$+ $$\frac{{{p^2}}}{{p + 1}}$$ &nbsp = ?

• A. p3
• B. $\frac{1}{{2{p^2}}}$$
• C. + 3
• D. $\frac{1}{{p + 3}}$$