Let's look at the options and convert them into a common unit. In this case, we will convert all units to mL.
We know, 1 L = 1000 mL and 1 cu. cm = 1 mL.
Option 1: 6 L = 6 × 1000 = 6000 mL
Option 2: 6308 mL
Option 3: 6300 cu. cm = 6300 mL
Option 4: 6 L 38 mL = 6 × 1000 + 38 mL= 6038 mL
Option 5: 6303 cu. cm = 6303 mL
So the descending order of volumes would be:
6308 mL > 6303 mL > 6300 mL > 6038 mL > 6000 mL
or
6308 mL > 6303 cu. cm > 6300 cu. cm > 6 L 38 mL > 6 L