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If \( (m+1)^{\text {th }},(n+1)^{\text {th }},(r+1)^{\text {th }} \) terms of the A.P. \( a \), \( a+d, a+2 d, \ldots . \). are in G.P. while \( m, n, r \) are in H.P., then \( \frac{d}{a}= \)
(A) \( \frac{1}{n} \)
(B) \( -\frac{1}{n} \)
(C) \( -\frac{2}{n} \)
(D) \( \frac{2}{n} \)
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