A brutal SC question - Explantion required

[papumba2011]

52. 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


The answer given is D. No explanation is given. What's wrong with A?

[papumba2011]

Another question:

60. The computer software being designed for a project studying Native American access to higher education will not only meet the needs of that study, but also has the versatility and power of facilitating similar research endeavors.
(A) but also has the versatility and power of facilitating
(B) but also have the versatility and power to facilitate
(C) but it also has the versatility and power to facilitate
(D) and also have the versatility and power of facilitating
(E) and it also has such versatility and power that it can facilitate

The ans is B. My question is is the use of "have" is fine or should we use "has" since it refers to computer software.

Please let me know if I am making any mistake here.

[jitendra_mulchandani]

Please find below the link for the two questions:
1st : https://www.beatthegmat.com/ancient-romans-t50981.html
2nd : https://www.beatthegmat.com/computer-s-w ... 30840.html