This choice uses the correct, plural form problems and uses adjectives to describe the problems. The original phrase is incorrect because severely is an adverb and not an adjective. The other choices are incorrect because problem instead of the grammatically correct problems is used.
The original agrees with the singular, noun and the and indicates that velocity is used to indicate more than one value.
This choice uses the grammatically correct their instead of there. The to indicates the companies are using these sites for something, and services and products agree with each other because they are both plural.
This choice states that an autoclave is a tool used to sterilize. Beginning with to sterilizing and for sterilize, are not grammatically correct. The other choice indicates that the machine is used to sterilize a single tool and needle, which does not make sense in the context of the sentence.
This choice is best because it is grammatically correct and identifies electric eels as the bizarre creatures being discussed in the sentence.
This choice makes sense and the singular a key factor and is agree with each other.
This choice is the only choice that has correctly placed commas. The numerous moons and the Great Red Spot both refer to the planet Jupiter, which is maintained in this answer.
This answer is succinct, the comma is in the correct place, and it expresses the information is a clear way that is not awkward.