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My answer is D

A) Unlike smaller apartment buildings, which have fewer than four residential units in them
Reason to eliminate - Comparison between Smaller Apartment Buildings and Room in residential complex. The logical comparison can be between Apartment Building with Residential Complex.

B) Apart from those apartments that are in buildings that contain fewer than four residential units
Reason to eliminate - Those apartment and Room are not parallel. Also "Those" - What does Those refer to? Room and Apartment are not parallel. The sentence structure conveys meaning incorrectly

C) In contrast to smaller apartment buildings that contain fewer than four residential units
Reason to eliminate - Incorrect comparisons between small apartment building and the room.

D) Unless the apartment building contains fewer than four residential units
Correct choice

E) Excluding those apartment buildings that have fewer than four residential units in them
Reason to eliminate - Those - What does "those" refer to?
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IMO D

A) Unlike smaller apartment buildings, which have fewer than four residential units in them - Like and unlike is used to compare similar things and hence we cannot compare smaller apartment buildings with each room. Further the use of "in them" is erroneous.

B) Apart from those apartments that are in buildings that contain fewer than four residential units - again the comparison is between apartments and each room which is illogical.

C) In contrast to smaller apartment buildings that contain fewer than four residential units - same error as B

D) Unless the apartment building contains fewer than four residential units - Correct answer with clear meaning and structure.

E) Excluding those apartment buildings that have fewer than four residential units in them - incomplete sentence and illogical meaning as there must be something logical after the ing phrase + comma. Further the use of In Them is erroneous.
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Unlike smaller apartment buildings, which have fewer than four residential units in them, each room within any residential complex must be equipped with a sprinkler system.

A) Unlike smaller apartment buildings, which have fewer than four residential units in them -> Unlike hints for comparison, are we comparing smaller apartment buildings with each room. Incorrect.

B) Apart from those apartments that are in buildings that contain fewer than four residential units -> those apartments are not parallel to each room. Incorrect.

C) In contrast to smaller apartment buildings that contain fewer than four residential units-> It is similar to A. Incorrect.

D) Unless the apartment building contains fewer than four residential units -> each room is working as modifier. Let's keep it.

E) Excluding those apartment buildings that have fewer than four residential units in them -> It is similar to B. Incorrect.

So, I think D. :)
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Eliminate, A, B, C and E - sentence structure are in comparison tone, which has nothing to compare.
A) Unlike smaller apartment buildings, which have fewer than four residential units in them
B) Apart from those apartments that are in buildings that contain fewer than four residential units
C) In contrast to smaller apartment buildings that contain fewer than four residential units
E) Excluding those apartment buildings that have fewer than four residential units in them

Conditional Sentence structure tone:
D) Unless the apartment building contains fewer than four residential units
each room within any residential complex must be equipped with a sprinkler system
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