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c. a blizzard of activity
In the first sentence “Filling “is a GERUND. The gerund has the function of a noun and in this particular example it is part of the subject of the sentence. In the last sentence “to run” and “to walk” is an INFINITIVE. Finally, in the third one, “riding” is a PARTICIPLE. A participle has the function of an adjective and in this particular example it is part of a participle clause.
Answer:
The SI system of metric units is very practical because the meter, kilogram, second and ampere used in theoretical computations in electrical and mechanical engineering correspond to actual everyday units used to rate household appliance electricity consumption and for customary weights and measures.
Explanation: