Question

Yo ________ viajar por carretera y me alojaría en un albergue juvenil. A. preferirían B. preferirías C. preferiría D. preferiríamos

Answer 1

Yo is a single person, Verb condicional .
Answer C : preferiría

Answer 2

The best answer to this sentence is C. Preferiria because it's only talking about one person, like "yo" means "I'. And the rest of the answer choices are talking about more than one person..

Translated - I "would rather" (means preferiria) travel by road and I would stay in a youth hostel.

So.. yea the answer is C. Preferiria. Glad to help!! :)