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Answer:
The correct answer is a. Soldering.
Explanation:
When you join two metals together using heat, it's called soldering. It's like using a special metal, solder, to melt and stick the metal pieces together. I learned about this in shop class when we were making electronic circuits.
We heated up the solder with a soldering iron until it melted, then applied it carefully to the metal parts we wanted to connect. It's a neat way to make sure metal pieces stay together well.