Final answer:
A line of programming code is a set of instructions written in a programming language that a computer can understand and execute. Out of the given options, sentence A: If temperature is more than 30 degrees C, run fan, else, run heater could be a line of programming code.
Step-by-step explanation:
A line of programming code is a set of instructions written in a programming language that a computer can understand and execute. Out of the given options, sentence A: If temperature is more than 30 degrees C, run fan, else, run heater could be a line of programming code. This sentence contains an if-else statement, which is commonly used in programming to make decisions based on certain conditions.