With practice, both kendra and jason mastered the violin.

Part of a compound subject, both of them are using the same verb to describe

Explanation:

from the political point of view it could be said that the candidate   is an effective speaker because she takes a strong position on the issue. it is an open discussion but probably she is making a presentation and can choose which subjects she wants to address. she is very likely to attain her aim which is to convince voters to accept her proposal.

it probably should so i can spam dank memes