Option b .outer rail will wear out faster
Option c .outward pressure on inner rails is more than outer rail .
Option d.inward pressure on outer rails is more then inner rail.
Solution:
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Your question is not clear and appears to be incomplete. Recheck your question or please be a
little specific about the name of the chapter/textbook to which you are referring here so that we
can provide you with some meaningful help.
Look forward to hearing from you again!