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See photo for solution and mark me as brainliest if you think i helped!
Answer:
Step-by-step explanation:
for c- start at 0, go to the left and stop right above the zero. do not put a point. then go down and stop in between -2 and -3. put a point
For D- start at zero. go to the right and stop between the four and the end of the line. Do not put a point. Then go up one box. put a point.
Here is your answer

REASON :
ab+ab=2ab
Verification:
ab+ab
taking a as common from both terms
a(b+b)
=a×2b
=2ab
HOPE IT IS USEFUL