Which sentence could be a line of programming code?

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In programming, a conditional line typically follows an if-else pattern: test a condition, do one thing if it's true, otherwise do another. This sentence matches that exactly: if temperature is more than 30 degrees C, run the fan; otherwise run the heater. The condition is a clear boolean test, and the two actions are simple, distinct operations. You can easily translate it into code, for example: if (temp > 30) { fan(); } else { heater(); }. The other options read more like natural language instructions or describe looping behavior, rather than presenting a crisp, one-line if-else decision.