Question 1: Examine the four █ in the selection below and indicate at which block the following sentence could be inserted into the passage:
Seagrasses grow together in dense patches, or beds, with as many as 4,000 blades per square meter.
Many areas of the shallow sea bottom are covered with a lush growth of aquatic flowering plants adapted to live submerged in seawater. █ [A]These plants are collectively called seagrasses. █ [B] Seagrass beds are strongly influenced by several physical factors. █ [C] The most significant is water motion: currents and waves. █ [D] Since seagrass systems exist in both sheltered and relatively open areas, they are subject to differing amounts of water motion.