If one root of the equation (l-m)x^(2)+l...

If one root of the equation `(l-m)x^(2)+lx+1=0` is double the other and `l` is a real number, then which of the following is true ?

A

`mgt(9)/(8)`

B

`m gt (8)/(9)`

C

`m=(8)/(9)`

D

`mle(9)/(8)`

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