1 kg is about 2.2 pounds. Multiplying these numbers by 100 gives you ...
100 kg is about 220 pounds.
The appropriate choice is ...
... D. 100 kg
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You need to be a little careful with units. The unit of mass in the MKS system is the kilogram. Its abbreviation is kg, where the k is a prefix letter meaning "kilo-" or "times 1000." The question asks "how many kilograms ...", so an appropriate answer is either a number that is a number of kilograms (100), or a number of kilograms (100 kg).
The number <em>100 k</em> means 100,000. This is <em>not</em> the correct number of kilograms, nor is it a mass whose units are kilograms.
