Step 1: Understanding the Argument.
The critic claims that the improvement in ballet quality in the U.S. is due to more Europeans teaching there. The critic’s evidence: last year in New York, more teachers he personally met were Europe-born and trained than ever before.
Step 2: Identifying the Assumption.
The critic is generalizing from personal observation in one location (New York) to the entire U.S. ballet teaching population. For the reasoning to hold, the group of teachers the critic met must be representative of all ballet teachers in the United States. Otherwise, the conclusion is unreliable.
Step 3: Analyzing Options.
- (A) Talks about birthplace vs. training, but this doesn’t address the core flaw of representativeness.
- (B) This directly points to the critic’s questionable assumption — that the teachers he met in New York are typical of U.S. ballet teachers overall. This is the flaw.
- (C) Incorrect — the critic did not compare ballet teaching in Europe vs. U.S.
- (D) Mentions "mental attitudes," but the critic was not talking about mental attitudes; only teaching origins.
- (E) The critic is not comparing dancers’ talent, only teachers’ backgrounds.
Step 4: Conclusion.
The flaw lies in assuming that a limited observation in New York is representative of all ballet teachers in the United States. Hence, the correct answer is:
\[ \boxed{\text{(B) The argument assumes the teachers met in New York were typical of all U.S. ballet teachers.}} \]
How many triangles are there in the figure given below? 