Overtime, his work grew dark and moody. He began to paint angry scenes in thick, dark colors. Art historians have long debated the reasons for this shift in Goya's style

In the paragraph, the sentence about art historians implies that
a. art historians are argumentative
b. the theory stated is definitely true
c. the theory states is definitely false
d. there are other theories to explain Goya's change in style
e. not everyone believes there was a definite shift in Goya's style

IS THE ANSWER "D"?

Yes, right.

Yes, the answer is D. The sentence about art historians implies that there are other theories to explain Goya's change in style. This means that not everyone agrees on one specific reason for the shift in Goya's style and that different art historians have their own interpretations and theories.