Which statement best describes the condition the substrate should be in before priming?

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The key idea here is that primer needs a surface that it can wet and bond to. A dry, clean surface free of oil, wax, dust, and other contaminants allows the primer to flow evenly and grip the substrate, forming a strong, durable bond. Moisture, oil, or any residue creates a barrier that prevents proper adhesion, which can lead to blisters, fish-eyes, or peeling later on. So you want the substrate to be dry, clean, and free of contaminants so the primer can cure correctly and provide a solid base for the subsequent coatings. Typical prep steps include washing, degreasing, drying thoroughly, and wiping with a tack cloth to remove dust.