What is the best speed to use when answering a CQ in Morse code?
The fastest speed at which you are comfortable copying, but no slower than the CQ
The fastest speed at which you are comfortable copying, but no faster than the CQ✓Bonne réponse
At the standard calling speed of 10 wpm
At the standard calling speed of 5 wpm
Explication
Answering at or below the caller's speed keeps the exchange inside what both operators can handle: the calling station has already shown the speed it can send, and it may not be able to receive faster. It also has to stay within your own comfortable copying speed, since you must receive the reply.