rather than Vs instead of -? - urgent my GMAT on 4thNov

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What is preferred "rather than" or "instead of"
and "in that" Vs "because"

I found this SC in my GMATprep exam today and not sure
why the answer is choice D. Any insight will be
helpful...

The parachute like membranes of Africa's scaly-tailed
flying squirrels differ from those of the flying
squirrels in the family Sciuridae /u because they are
attached to a cartilage rod at the elbow instead of /u
the wrist

a. because they are attached to a cartilage rod at the
elbow instead of

d. in that they are attached to a cartilage rod at the
elbow rather than at

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by prachipareekh » Fri Nov 03, 2006 1:17 am

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Thanks. What about "in that" is almost obsolete and is not preferred much... any idea between "because" and "in that" which one should be preferred

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by 800guy » Fri Nov 03, 2006 5:11 pm
check out the Beat The GMAT flashcards: https://www.beatthegmat.com/viewtopic.php?t=32

and Sahil's SC Notes: https://www.beatthegmat.com/viewtopic.php?t=26

"in that" is preferred over "because"