OFFICIAL EXPLANATIONGRAMMATICAL CONSTRUCTIONThis sentence should use the comparative construction where ‘'X’ happened that 80 ‘Y’ could happen. ‘so’ here introduces a clause of purpose, explaining the reason for the action in the main clause. ‘Mary sought to have her engagement. .. . . annulled so that she could marry Robert’. The relationship between the two clauses is clear.
(A) This does not identify who will marry, hence, incorrect; ‘So as’ should be followed by an infinitive and not participle.
(B) This alternative is ungrammatical and illogical: ‘Mary could not get engaged simply on the basis of seeking an annulment.
(C) The infinitive here should be preceded by a conjunction (in order): ‘to marry’ is preferable to the wordier ‘to be married to’.
(D)
CORRECT. This sentence’s construction clearly shows the reason Mary sought an annulment; ‘could’ is more appropriate than ‘would’ because the annulment
would not ensure her ‘engagement'—it would only enable her to marry someone also.
(E} The conditional ‘would marry is incorrect.
Choice (D) is the correct answer