=== Model: grok-4.6-direct | Task: bench:gpqa_diamond | Rep: 1 ===
=== Score: 5/5 | Wall: 17.654s | Cost: $0.008368 ===
=== Pass: True | Finish: stop | In-reasoning-only: False ===

--- JUDGE ---
gpqa_diamond

--- RESPONSE ---
The impulse approximation treats a nuclear interaction (e.g., an electroweak current) as occurring on a single, essentially free nucleon. This is equivalent to the simultaneous imposition of three statements: the current is a one-body operator (assumption 1), the remaining nucleons neither absorb nor rescatter the probe (assumption 2), and the struck nucleon may be taken on-shell, i.e., binding forces may be neglected (assumption 4). Assumption 3, which concerns the internal quark dynamics of that nucleon, is irrelevant to the impulse approximation and is therefore omitted. The three required statements are precisely those listed in option D.

The answer is (D)