Electric vehicles have ___ charging ports, which means it can only be plugged into a charging station with a compatible connector.

• A. colorful
• B. distinct
• C. proprietary
• D. multiple

Answer: (B)

The idea being tested is compatibility: electric vehicles use different connector types, so the ports on a vehicle are distinct from one another. When ports are distinct, a charger must have the exact matching connector to fit and charge properly. That’s why the word distinct fits best—it expresses that the port type isn’t the same for every vehicle, creating the need for a compatible connector at the charging station. Colorful is irrelevant to charging; multiple would imply many ports on a single vehicle, which isn’t the point here; proprietary suggests ownership by a company and exclusivity, which isn’t the focus of this sentence.