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Which of the following pairs of ions have the same electronic configuration
$$\text{Cr}^+$$, $$\text{Fe}^{3+}$$ and $$\text{Mn}^{2+}$$ all have 23 electrons with configuration $$[\text{Ar}]3d^5$$. $$\text{Cr}^{3+}$$ is $$[\text{Ar}]3d^3$$ and $$\text{Sc}^{3+}$$ is $$[\text{Ar}]$$, so pairs c and d differ. Hence options a and b are both correct.
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