My answer is C.
and thanks for such a wonderful explanation.[/quote]
I dont agree with you on
"Jane and William will represent our school at the modern arts convention; because their creations have been outstanding this semester"
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(A) convention, for their creations have been outstanding this semester -
(B) convention, their creations in this having been outstanding this semester - (being; having been are always a big avoid on GMAT)(C) convention; their creations this semester have been outstanding - correctly maintains the two independent clauses, and also with the sequencing of events (creations; this semseter; have been outstanding)
(D) convention; they having been outstanding in their creations this semester
(E) convention, for they have this semester done outstanding creations - last clause "is awkward contruction o the sentence....also "they" can refer to any noun.

I more or less agree with C although I thought "their creations this semester have been outstanding" sounds awkward compared to A.

So my question would be: Is it absolutely to wrong to use a comma before "for", when "for" is being used in place of because?
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petrifiedbutstanding

i will go with C
its clear n crisp
with semicolon, two indep clauses are used
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imo a

from og
The Olympic Games helped to keep peace among the pugnacious states of the Greek world in that a sacred truce was proclaimed during the festival's month.

(A) Same
(B) world, proclaiming a sacred truce during the festival’s month
(C) world when they proclaimed a sacred truce for the festival month
(D) world, for a sacred truce was proclaimed during the month of the festival
(E) world by proclamation of a sacred truce that was for the month of the festival

oa is d - as "for" stands for because

for as subordinator is wrong with "," and hence A and E are out.
between B,C,D

B "sentence is awkward as "this" spoils the sentence.

D : they and their are ackward


hence C
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-------Analyze why option A in SC wrong-------

+1 for C. Independent clauses.

I had trouble with this at first. A and C are both grammatically correct. You can connect two independent and related sentences with either a semi-colon or a comma and a FANBOY (the comma can be optional depending on how it affects the meaning). Here each clause in A and C is independent. For is the correct conjunction because it shows purpose or why (basically, "for" functions identically to "because," except that "for" is for connecting 2 independent clauses instead of a dependent clause to an independent clause).

So why A or C if each construction is okay? Let's look at the differences:

(A) convention, for their creations have been outstanding this semester
(C) convention; their creations this semester have been outstanding

Whenever something moves around, ALWAYS consider how it affects the meaning because it is often a modifier issue. Here, what is "this semester" modifying?

In A, it modifies the verb "have been" and tells us when the creations were outstanding. This is an improper meaning because it implies that the creations existed before this semester and now are outstanding (think of a sports player that is having a good season this year). It is odd to say that art was outstanding during a specific time period - art would be either outstanding or not and that wouldn't change.

In C, it is a restrictive modifier for "their creations" and tells us that their creations that came into existence this semester are outstanding. Therefore, C has the correct intended meaning.

I am going to give my 2 cents.....
Option A: convention, for their creations have been outstanding this semester--> "This semester" is modifying have been. Means The creation existed before and now become outstanding. This is not the intended meaning. Intended meaning is this semester creations are outstanding. hence "this semester" is a noun modifier.

As this is noun modifier should be placed next to noun creation. Hence option A is wrong.

For can be preceded by "," when working as conjunction in a sentence.
Option C: convention; their creations this semester have been outstanding--> Two independent clauses are connected by ";"--Correct.
Modifier error is rectified ("this semester" clearly modifies creation.) Intended meaning is preserved. Hence option C is correct
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-------Analyze why option A in SC wrong-------