A particle moves in a straight line and passes through \( O \), a fixed point on the line, with ...

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A particle moves in a straight line and passes through \( O \), a fixed point on the line, with a velocity of \( 6 \mathrm{~ms}^{-1} \). The particle moves with a constant retardation of \( 2 \mathrm{~ms}^{-2} \) for 4 seconds and thereafter moves with constant velocity. How long after leaving \( O \) does the particle return to \( O \) ?
(A) \( 8 \mathrm{~s} \)
(B) Never
(C) \( 4 \mathrm{~s} \)
(D) \( 6 \mathrm{~s} \)
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