If one root of the equation \( (l-m) x^{2}+l x+1=0 \) is double the...

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If one root of the equation \( (l-m) x^{2}+l x+1=0 \) is double the other and if \( l \) is real, then the greatest value of \( \mathrm{m} \) is
P
(V)
(a) \( \frac{9}{8} \)
(b) \( \frac{7}{8} \)
(c) \( \frac{8}{9} \)
(d) \( \frac{8}{9} \)
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