A Particular Solution of the Differential Equation $y ^ { \prime \prime } + 2 y ^ { \prime } + y = e ^ { x }$

Multiple Choice

A particular solution of the differential equation $y ^ { \prime \prime } + 2 y ^ { \prime } + y = e ^ { x }$ is

A) $y _ { p } = 4 x e ^ { x }$
B) $y _ { p } = x ^ { 2 } e ^ { x } / 2$
C) $y _ { p } = 2 x ^ { 2 } e ^ { x }$
D) $y _ { p } = e ^ { x } / 4$
E) $y _ { p } = e ^ { x }$