Passage Summary: A historian thinks one artist influenced another. Even though the artist's diary doesn't talk about it much, they met often, had mutual friends, and used the same unique words that nobody else was using at the time.

Reasoning: Stuart met West several times, Stuart's close friend studied under West, and Stuart used West's unique terminology that no one else used at the time.

Analysis: The historian provides several pieces of circumstantial evidence to support the claim of influence, specifically targeting the weakness of the 'diary' objection. The most compelling evidence is the use of unique terminology, which is a classic indicator of intellectual influence. Look for an answer that reflects the idea that a lack of written record in a diary does not prove a lack of influence, especially when other strong indicators are present. The goal is to find a proposition that the historian's evidence makes highly likely.