Linguist: Only if a sentence can be diagrammed is it grammatical. Any grammatical sentence is recognized as grammatical by speakers of its language. Speaker X' s sentence can be diagrammed. So, speaker X' s sentence will be recognized as grammatical by speakers of its language. The linguist's reasoning is flawed because it fails to consider the possibility that
A: some ungrammatical sentences are diagrammable
B: all grammatical sentences can be diagrammed
C: some ungrammatical sentences are recognized as ungrammatical
D: most people are unable to diagram sentences correctly
Choose A, B, C or D as your solution.
A