If \( a_{1}, a_{2}, \ldots \ldots \). are in H.P. and \( f(k)=\sum_...

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If \( a_{1}, a_{2}, \ldots \ldots \). are in H.P. and \( f(k)=\sum_{r=1}^{n}\left(a_{r}-a_{k}\right) \), then \( \frac{a_{1}}{f(1)}, \frac{a_{2}}{f(2)}, \ldots \ldots . \frac{a_{n}}{f(n)} \) are in
(A) A.P.
(B) G.P.
(C) H.P.
(D) None of these
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