Step 1: Understanding the Argument.
The passage argues that the self-portrait cannot be from 1930. Why? Because in 1930 Brandon was 63 years old, but the painting shows a much younger man.
So, the reasoning assumes something: if Brandon was 63, he would not have painted himself looking young.
Step 2: Analyzing the Options.
- (A) Talks about the existence of other portraits but doesn’t address the reasoning of this argument.
- (B) Talks about Brandon’s intentions in not dating his works — irrelevant to the argument.
- (C) Talks about literature available — again irrelevant.
- (D) Directly supports the reasoning. If we assume Brandon would not have painted himself looking younger when he was actually 63, then the conclusion that the dating is wrong follows logically.
- (E) This only says he painted himself older at times, but does not rule out the possibility of painting himself younger too.
Step 3: Conclusion.
The assumption needed is that Brandon, when 63, would not have painted himself as a young man. This ensures the dating to 1930 is wrong. Hence, the correct answer is:
\[ \boxed{\text{(D) Brandon at age 63 would not have portrayed himself as a young man.}} \]




