Among your options, there is only one clause, and that would be A. "she got soaked walking."
When it comes to clauses, they need to have a subject (she in A), and a verb (got soaked in A). The other options don't have both the subject and the verb and thus cannot be considered clauses. There is however another clause in this sentence (because her umbrella was in her gym locker), but it is not one of your options.
I’d say you would need to know if they have any type of super powers and if they have the traits of a super hero
They were walking through the hall and she fell down on someone sat on them and fell back....
To see if it sounds right out loud so you can make corrections, hope that helps!