Answer:
C is the answer!
Explanation:
A hard drive contains your operating system which can include your settings and preferences that you included in your device. But it mostly is a storage device so we know it WOULD NOT BE (B.
WOULD NOT BE D beacause powering it back on wouldnt do anything but bring you back to the start.
WOULD NOT BE A beacuse when taking out the battery then putting it back in would just be like turning it off then back on beacuse that just hold the power to a device.
IT WOULD BE C, C IS THE ANSWER beacuse a CMOS batttery contains the main system settings and  also contains information so i think C would be the best answer for this choice.
Hope this helps! 
xx <3
 
        
             
        
        
        
When someone may be giving away something for free.
 
        
             
        
        
        
This question should be in physics so this is my answer in C&T format-go to a online shop and order one or the pieces then follow the instructions that will be given.
        
             
        
        
        
Answer:
Check the explanation
Explanation:
The programmable code to solve the question above will be written in a python programming language <u><em>(which is a high-level, interpreted, general-purpose programming language.)</em></u>
<u><em /></u>
f = open('thisFile.txt', 'r')
w = open('thatFile.txt', 'w')
count = 0
for line in f:
    if count % 2 == 0:
        w.write(line)
    count += 1
w.close()
f.close()