the arch is one of the most important structural developments in the history of architecture. by including…

the arch is one of the most important structural developments in the history of architecture. by including this sentence, the author is best able to -- a provide qualifications that enhance an argument b establish a viewpoint that will be supported by facts c state factual information that strengthens the impact of the article d express an opinion that adds interest to the article

the arch is one of the most important structural developments in the history of architecture. by including this sentence, the author is best able to -- a provide qualifications that enhance an argument b establish a viewpoint that will be supported by facts c state factual information that strengthens the impact of the article d express an opinion that adds interest to the article

Answer

Brief Explanations:

The sentence "The arch is one of the most important structural developments in the history of architecture" is a viewpoint. The rest of the text (about how arches are constructed, their properties like handling great weight without breaking) would support this viewpoint. It's not just an opinion (as it's presented in a factual - sounding way in the context of an architectural discussion), not just adding interest (it's a central claim), and not just stating a fact (as it's a value - judgment based on its importance in architecture history which needs support).

Answer:

B. establish a viewpoint that will be supported by facts