The correct option is C RQSP
The sentence has two clauses. In first clause, R includes the first verb, and Q the rest of the predicate. In second clause, S contains the subject and R the rest of the second clause's predicate. Hence, the structure should be RQSP, that is, "Although the motion received general support it was not carried until it had been considerably amended." and Option D is correct. The rest of the options do not adhere to this rule, hence incorrect.