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If point $(1, 2)$ is the mid-point of the line segment joining the points $(3, 5)$ and $(2a, b)$, then $(a, b) =$
- (a)$(-1, -1)$
- (b)$\left( -\frac{1}{2}, -\frac{1}{2} \right)$
- (c)$\left( -\frac{1}{2}, -1 \right)$
- (d)$\left( -1, -\frac{1}{2} \right)$
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Ans: (C) $\left( -\frac{1}{2}, -1 \right)$