Answer: Option (a) is the correct answer.
Explanation:
A subjective statement is defined as the statement which tends to express a belief or judgement about something.
For example, Van Gogh painted beautiful works of art.
In this statement, according to the believer Van Gogh's work of art are beautiful. This means that he believes that Van Gogh's work is good or beautiful.
Whereas the statements planets revolve around the sun, blue is a color, and Einstein was a scientist are all universal truth and not an opinion or belief of someone's.
Thus, we can conclude that the statement Van Gogh painted beautiful works of art is subjective.