Technical excerpt: [1] The passage explains the early sound by linking turbulent flow through a small opening to acoustic detection before pressure loss. [2] Sensors detected a high-frequency hiss near one pipe joint before pressure readings showed a noticeable drop. [3] The maintenance team represented leaks as small openings that create turbulent sound before enough fluid escapes to lower pressure. [4] They proposed that the hiss is an early sign of a small leak at the joint. [5] If the hiss indicates a leak, sealing the joint should remove the sound while keeping pressure stable. A student says that Statement 4 should be classified by what it does in the reasoning, not by whether its topic is scientific. Which classification is most precise?