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Battery: changes chemical energy to electrical energy. 
Explanation: A battery is a device that is able to store electrical energy in the form of chemical energy, and convert that energy into electricity.
Drum: changes mechanical energy to sound energy.
Explanation: Sound is mechanical energy - vibrations in the air. A musical instrument's sound is the result of physical objects vibrating and transferring those vibrations to the air, which then travel to your ear.

Battery: changes chemical energy to electrical energy. 
Drum: changes mechanical energy to sound energy.

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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.