The lumbricals are used during an upstroke in writing
The most accurate way to describe the excerpt is to choose the option - it is a dependent clause. This means that something needs to be added - you need to finish the sentence so that it becomes an independent clause, and not a subordinate one.
Answer:
The three tornadoes' winds reached 200 miles per hour.
Explanation:
In order to make a noun possessive, you need to add an apostrophe (') and -s if the noun is singular: Jane - Jane's. If the noun is plural, you should just add the apostrophe: tornadoes - tornadoes'. There is no need to add an additional -s since the noun is already plural.
When we call a noun possessive, it means that something belongs to it. In the example above, the winds belong to the tornadoes.