TOEFL Reading: ETS-TOEFL阅读机经 - H6GP1JP469C5C825L$

According to paragraph 1, which of the following best illustrates the development of portrait painting as an art form? A. It started as a minor art form, but became progressively more popular B. It is a comparatively stable art form due to its fixed subject matter C. It has been subjected to consistent and major style shifts D. It was the first art form concerned with the identity of the subject