"in that" vs. "because"
http://www.manhattangmat.com/forums/post14608.html
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"since" can mean two different things: (a) a statement about time ("since x happened" = during the period time after event x), or (b) a statement about causality (approximately equivalent to "because").
if the gmat means "because", it will probably say "because". therefore, it's somewhat unlikely, though not impossible, that you'll see "since" in the sense of causality.
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"while" can mean "during", but can also be an indicator of
contrast, roughly equivalent to "although".
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"inasmuch" is one word, and is ALWAYS followed by "as".
inasmuch as means, roughly "to the extent that..."