I am merely a beginner, however I believe it is C. :)
Answer:
try thinking if you were talking with your friend about a road trip what would you say
Answer:
that
Explanation:
Relative pronouns like <em>that, which </em>and <em>who</em> are used to add information or define something. In the sentence given, that introduces a defining relative clause that specifies the kind of birds: the ones that have the strongest talons.
The rest of the options are incorrect because <em>of </em>is a preposition, <em>strongest </em>is an adjective in the superlative form, and <em>such as</em> is an adverbial phrase that means for example.