Answer:
constant, if slow, motion and are frequently blasted by strong winds, these clumps roll around a bit like tumbleweed.
The best way to describe the sentence " In 1984, Byron Lichtenberg, who is a biomedical engineer became a member of a spacecraft crew." is complex. The correct answer is C, complex.
The best answer among the following choices would be the second option B) because C) and D) are normal sentences while B) is complex and A) is fine but needs to replace ''has a tendency'' with ''tends''.