Because we don't know what the result of the scenario of talking on the phone with Walter is, this would be the dependent clause.
Hope this helps!
<em>Requisite</em>
Made necessary by particular circumstances or regulations.
"the application will not be processed until the requisite fee is paid"
synonyms: necessary, required, prerequisite, essential, indispensable, vital, needed, needful
This would mean that the correct answer to your uestion would be C. Nikkita didn't get the job because she didn't posses the [Nesscary/Requisite] (exam?).
1 : hyperbole
2 : simile
3 : metaphor