Which of the following are true about transition metal elements ?

(a) As the atomic number increases for d-block transition elements, electrons are in general added to an inner d orbital

(b) Metals in high oxidation states tend to be good reducing agents

(c) A common oxidation state of manganese is +4

(d) Going across a period the atomic radii does not change a great deal.

(e) As the atomic number increases for the lanthanides and actinides transition metal elements, electrons are added to an inner f orbital.

Answer:
Id say C since Manganese can be seen in its Mn(IV) oxidation state as MNO2 when water reacts with Manganese.
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