Ethos, pathos, and logos. Ethos is appealing to the reader by the author establishing his credability. Pathos is appealing to the reader by the author "pulling at the readers heart strings." This means he is illiciting emotions in the reader. Logos is appealing to the reader by the author establishing logic in his argument. These stratagies are used by all authors, not just historical fiction writers.
Genevieve is the answer to your question
The correct verb form is A. "Climbs."
The other verbs in the sentence use the present tense form, so the verb "climb" does too. The verbs used are "barks" and "gets." So the correct verb form should be "climbs."