(D) Long day plants $(LDP)$ are those that require a light period longer than a critical duration to flower. Among the given options, $Spinacia \text{

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(D) Long day plants $(LDP)$ are those that require a light period longer than a critical duration to flower. Among the given options, $Spinacia \text{ } oleracea$ (Spinach) is a classic example of a long day plant. $Glycine \text{ } max$ (Soybean) is a short day plant $(SDP)$, and $Mirabilis \text{ } jalapa$ is a day-neutral plant.