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If a line segment \( A M=a \) moves in the plane \( X O Y \) remaining parallel to \( O X \) so that the left end point \( A \) slides along the circle \( x^{2}+y^{2}=a^{2} \), the locus of \( M \) is
(A) \( x^{2}+y^{2}=4 a^{2} \)
(B) \( x^{2}+y^{2}=2 a x \)
(C) \( x^{2}+y^{2}=2 a y \)
(D) \( x^{2}+y^{2}-2 a x-2 a y=0 \)
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