46.3
A. Meters need to be converted to millimetres
1 m = 1000 mm
46.3 m x 1000 mm/m = 46 300 mm
therefore this is correct
2. meters need to be converted to hectometer (hm)
100 m = 1 hm
46.3 m x 1/100 hm/m = 0.463 hm
this is correct
3. meters are converted to centimetres
1 m = 100 cm
46.3 m = 46.3 m x 100 cm/m = 4630 cm
This is correct
4.meters are converted to kilometers
1000 m = 1 km
46.3 m = 46.3 m x 1/1000 km/m = 0.0463 km
The option given is 0.00463 km, therefore this is the incorrect option