One reason some particle physicists are switching to astronomy late in their careers is that they tire of spending years constructing environments in which they can conduct experiments; astronomers have an infinite and ready-made supply of environments at their disposal.A. One reason some particle physicists are switching to astronomy late in their careers is that they tire of spending years constructing environments in which they can conduct experiments; astronomers have an infinite and ready-made supply of environments at their disposal.
B. Late in their careers, one reason that some particle physicists are switching to astronomy is suggested by the fact that particle physicists must spend years constructing environments in which they can conduct experiments, while astronomers have an infinite and ready-made supply of environments at their disposal.
C. Late in their careers, one reason that some particle physicists are switching to astronomy is suggested by the fact that particle physicists must spend years constructing environments in which they can conduct experiments, while an infinite and ready-made supply of environments is at the disposal of astronomers.
D. The fact that particle physicists must spend years constructing environments in which they can conduct experiments while astronomers have an infinite and ready-made supply of environments at their disposal is one reason, late in their careers, some particle physicists are switching to astronomy.
E. The existence of an infinite and ready-made supply of environments at the disposal of astronomers compared with the fact that particle physicists must spend years constructing environments in which they can conduct experiments suggests one reason some particle physicists are switching to astronomy late in their careers.
the answer is A. But can anyone help me with answer A? I consider the '; '',' so I think there shold be a conjunction before astronomers