This phrase isn’t used in a way that conveys a negative attitude toward the proponents. It’s merely a neutral phrase used as part of a description of the proponents’ philosophy.

This phrase isn’t used in a way that conveys a negative attitude toward the proponents. It’s used as part of a sentence that describes how Modern movement proponents treated architects who held a different philosophy. But this doesn’t indicate any disapproval of the way in which the proponents treated other architects’ work.

This phrase isn’t used in a way that conveys a negative attitude toward the proponents. It’s used as part of a sentence that describes how Modern Movement proponents treated architects who were perceived to have elements of their work that were modern. Proponents identified those architects as innovators. But the word “innovators” doesn’t reveal how the author feels about the proponents.

This is the best answer. By “conveniently,” the author points out that the proponents are dishonestly focusing on certain aspects of innovative architects work as “modern,” while leaving out other aspects that don’t fit the proponents’ philosophy. By this word, the author shows that the proponents are disingenuous.

This phrase doesn’t reveal a negative attitude toward the proponents. It’s part of a description of the way in which 20th century construction methods had to allow for more inaccuracy due to the involvement of many independent construction contractors. But the phase doesn’t reveal how the author feels about the proponents.