Wernicke's aphasia is characterized by fluent but nonsensical speech, often with the use of irrelevant words or phrases that do not make coherent sense. Among the options you provided, the one that exemplifies Wernicke's aphasia most clearly is:
4. I spoke to the window at red o'clock.
This sentence, while grammatically correct, contains nonsensical elements ("to the window" and "at red o'clock") that do not convey a logical or meaningful message, which is indicative of Wernicke's aphasia. The other examples also have disjointed phrases but do so in a less fluent manner.