Question: The ancient Romans piped hot water through the walls and under the floors so as to warm up the rooms.

(A) so as to warm up the rooms
(B) and so would be able to warm up the rooms
(C) to warm the rooms up
(D) so that they could warm up the rooms
(E) in order that they would warm up the rooms

Correct Answer: D
Explanation: The following points could be used to justify the suggested alteration to the sentence:

• Parallelism
• Considering two distinct facts
• Modifiers

Given in the sentence: to heat the rooms, the ancient Romans installed hot water pipes beneath the flooring and through the walls.
On the GMAT, "so as to" is incorrect.
It requires So + Adjective + as in sentences like "so hot it burned my mouth," etc.
so that: After this, we need a verb.
so that: We require a subject or, alternatively, a phrase following this.
Make sure there is just one AGENT before "so as to" when using it from now on.
Here, the early Romans installed hot water pipes under the flooring and through the walls to heat the rooms.

A: Incorrect
It is an incorrect answer. It is incorrect as the idiom should be so X and to Y not the one given in the sentence.

B: Incorrect
This is the incorrect answer. Here the placement of the word “so” is wrong. “would”
The word “so” does not make much sense at all. Hence this should be eliminated.

C: Incorrect
This is an incorrect choice. In the given sentence, “Up” should come after “warm”. It is not making sense in the sentence. Hence it can be eliminated.

D: Correct
It is the correct answer. Here is the correct usage of “so” for the cause-and-effect relationship. This is making the sentence meaningful and hence is the correct choice.

E: Incorrect
It is the incorrect answer. It has some errors as it has used “that” after “in order”.
Also the use of the word “should” is incorrect here.

“The ancient Romans piped hot water through the walls and under the floors so as to warm up the rooms.” - is a GMAT sentence correction question. These types of questions contain grammatical errors in the underlined sentence, and we have to choose the correct statement from the options. GMAT sentence correction is part of GMAT verbal.

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