"Capabilities" vs "Abilities"


Senior Member
Persian (Farsi)
Hi there
I was wondering if you could let me know which one of the listed choices fits better in my self-made sentence.
- In order to get this job, you must first prove your...........and demonstrate us your good customers service skills. You must be able to effectively communicate over the phone.

a) capabilities
b) abilities

For me, both work here properly, but they differ the meaning of the sentence. Do you confirm it?
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