Option 1 -> "Rumble" describes a deep, continuous rolling sound, which perfectly matches the sound of thunder.
Option 2 -> "Crackle" refers to a series of sharp, snapping sounds like fire or dry leaves, not suitable for thunder.
Option 3 -> "Ripple" describes a gentle wave-like motion or sound, typically associated with water, not thunder.
Option 4 -> "Clank" is a sharp metallic sound, which doesn't describe thunder.
Hence, Option 1: rumble -> Thunder characteristically produces a deep, prolonged rolling sound that reverberates through the atmosphere, which is best described as a "rumble." This is the standard and most natural collocation in English. -> correct