The sentence which correctly uses the word "fused" is "Trent unknowingly left the stove on, and the spatula fused to the cooktop." (option C)
The verb "to fuse" is used to talk about something that has melted or something that has been blended or joined with something else. With this definition in mind, we can already eliminate options A, B, and D.
Option C is the correct answer. If Trent has left the stove on, that means the spatula ended up melting due to the heat and sticking to the cooktop. In other words, the spatula fused to the cooktop.
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