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If \( x=\sum_{n=0}^{\infty} a^{n}, y=\sum_{n=0}^{\infty} b^{n}, z=\sum_{n=0}^{\infty} c^{n} \), where \( a, b, c \) are in A.P. such that \( |a|1,|b|1 \), and \( |c|1 \), then \( x, y \), zare in
(A) A.P.
(B) H.P.
(C) G.P.
(D) none of these
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