Which statement best defines an electric field?
O A. force per unit charge on a negative source charge
B. force per unit charge on a negative test charge
OC. force per unit charge on a positive source charge
D. force per unit charge on a positive test charge

Your answer is c. explanation: plasma  is the fourth state of matter, derived from the gaseous state of matter.  plasma  can contain free  electrons  and/or  ions. while  plasma is never neutral, it can either be positively or negatively charged.  gases, however, are electrically neutral.

Because its reliable.   there is no pollution  the chances of a radiation leak is low

The anwser is: wave a has a greater pitch and frequency.