The answer is C genetics is something you can't control
i'd say be consistent, like working out everyday, or every other day.
another thing is to plan the goal well
It is A. sleeping deeply.
Delta waves, like other brain waves, are recorded with an electroencephalogram (EEG) and are usually associated with the deep stage 3 of NREM sleep, also known as slow-wave sleep (SWS), and aid in characterizing the depth of sleep.
They both seem like D lol