Which of the following element belongs to ' \( f \) ' Block element...

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Which of the following element belongs to ' \( f \) ' Block element ?
\( \mathrm{P} \)
(a) \( \mathrm{La} \)
(b) Ac
(c) \( \mathrm{Ce} \)
(d) \( \mathrm{Hf} \)
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