Mechanical Wave cannot travel in space vaccumes, which would be considered "Empty Space" in your situation.
I think it would be A
hope this helps.
A and C
Explanation:
Rectifier diodes are used in power supplies to convert alternating current (AC) to direct current (DC), a process called rectification. They are also used elsewhere in circuits where a large current must pass through the diode.
Answer:
Self-confidence
Explanation:
Boost your own self-confidence by living your life, not watching others live their fake ones!
The other choices do not fit as well as self-confidence does, but it's also a common phrase to say "boost your own self-confidence."
