Which of these number sentences is NOT true?

Step-by-step explanation:
A. Lets convert millimeters into kilometers.
[tex]1cm = 10mm \\ 10mm = 1cm \\ 10 \times 30 = 1 \times 30 \\ 300mm = 30cm \\ 30cm > 3cm[/tex]
since 4000000mm = 4km, A is true. (Not the answer)
B. Lets convert millimeters into centimeters.
[tex]1cm = 10mm \\ 10mm = 1cm \\ 10 \times 30 = 1 \times 30 \\ 300mm = 30cm \\ 30cm > 3cm[/tex]
Since 300mm > 3cm, B is true. (Not the answer)
C. Lets convert millimeters to meters.
[tex]1000mm = 1m \\ 1m = 1000mm \\ 1 \times 5 = 1000 \times 5 \\ 5m = 5000mm[/tex]
Since 5m = 5000mm, C is NOT true. (Answer)
D.Lets convert metres to kilometres.
[tex]1km = 1000m \\ 1 \times 2 = 1000 \times 2 \\ 2km = 2000m \\ 2km < 20km[/tex]
Since 2000m < 20km, D is true. (Not the Answer.)