Step 1: Identify the challenges discussed in the passage.
The passage states:
\textit{“there are significant challenges to widespread adoption, including technological limitations, regulatory hurdles, and public acceptance.”}
Step 2: Analyze the answer choices:
(A) Increase traffic accidents — Incorrect, the passage says autonomous vehicles reduce accidents.
(B) Lack efficiency — Incorrect, passage mentions improving efficiency.
(C) Technological limitations and regulatory hurdles — Correct, directly mentioned.
(D) Widely accepted by the public — Incorrect, passage implies public acceptance is a challenge, not widespread.