Which is farthest planet to a sun ?

$\begin{array}{1 1} a) Uranus \\ b)Neptune \\ c) Mercury \\ d) Pluto \end{array}$

Pluto is the farthest planet from the Sun, and has the longest orbit. On Pluto, a year lasts for 248.5 Earth years. Pluto's orbital path is unusual because it is elongated. When farthest from the Sun, it is about 4,500 million miles (7,400 million km) away - nearly 50 times farther away than Earth.