By opting to go with the literal sense of the word abstraction, meaning difficult to understand, painting complex forms perfectly describes the term abstraction in modern art.
What is abstraction?
Abstraction means to convey the feelings or emotions of someone towards a thing, which may or may not be understandable by everybody and may be difficult to understand.
Painting complex forms of art are can also be referred as abstract arts as they are difficult to be understood by a viewer and takes time to process and know the real meaning of the painting.
Hence, option B; painting complex forms is the phrase, which best describes the abstraction in modern art world.
Learn more about abstraction here:
https://brainly.com/question/13072603
