When two cars reach an uncontrolled intersection (no signs or traffic signals) at the same time, who has the right-of-way?

Answer: C — Both drivers must yield

In an uncontrolled intersection, all drivers are expected to yield to other vehicles in order to ensure safety. This is because there are no signs or signals to indicate who should have the right-of-way. Choosing A or B is incorrect because there is no designated "right" or "left" car in this situation. Option D, choosing whoever honks first, is also incorrect because honking does not determine the right-of-way. Therefore, the correct answer is C, as both drivers must yield and proceed with caution.