Final answer:
A decumbent plant is one that grows along the ground with the tips of its stems turning upwards; it is not described by leaf density, color, or commonality in apartments.
Step-by-step explanation:
The description of a decumbent plant refers to a plant that grows along the ground but which has tips turning upwards. This growth pattern is not specifically related to the leaf density, color, or commonality in apartments as suggested by the options given in the question.
Instead, it is a distinct growth habit where the plant lies flat on the ground and then the ends of the stems turn upward.