If h(m+n) = m(h+r) find h in terms of m, n and r

A.
(h=frac{mr}{2m+n}) 
B.
(h=frac{mr}{n+m}) 
C.
(h=frac{m+n}{n}) 
D.
(h=frac{m+n}{m}) 
E.
(h=frac{mr}{n})
Correct Answer: Option E
Explanation
(h(m+n) = m(h+r)\
hm+hn=hm+mr\
hn=mr\
h=frac{mr}{n})