In order for an earthworm to lengthen several contiguous segments of its body, it must
A. contract its longitudinal muscles, which pulls up the chaetae and moves the body fluid perpendicular to the long axis of the worm.
B. contract its longitudinal muscles, which extends the chaetae into the surrounding soil and moves the body fluid parallel to the long axis of the worm.
C. contract its circular muscles, which extends the chaetae into the surrounding soil and moves the body fluid parallel to the long axis of the worm.
D. contract its circular muscles, which pulls up the chaetae and moves the body fluid parallel to the long axis of the worm.
E. contract its circular muscles, which extends the chaetae into the surrounding soil and moves the body fluid perpendicular to the long axis of the worm.
D. contract its circular muscles, which pulls up the chaetae and moves the body fluid parallel to the long axis of the worm.
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