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If `alpha` and `beta` are the roots of the equation `ax^2+bx+c=0` then `ax^2+bx+c=a(x-alpha)(x-beta)`.Also if a quadratic equation `f(x)=0` has both roots between `m and n` then `f(m) and f(n)` must have same sign. It is given that all the quadratic equations are of form `ax^2-bx+c=0` `a,b,c epsi N` have two distict real roots between `0 and 1`. The least value of c for which such a quadratic equation exists is (A) 1 (B) 2 (C) 3 (D) 4

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