Final answer:
A yellow and black traffic sign with a straight arrow followed by a right diagonal arrow indicates 'Right turn only'. This guides drivers to make correct and legal turns at intersections.
Step-by-step explanation:
The question you have asked is regarding the interpretation of a traffic sign which features a straight arrow and a diagonal arrow. This sign is designed to convey two different directions of travel that are permitted from a particular lane. The correct interpretation of a yellow and black sign with a straight arrow followed by a right diagonal arrow leading back into the straight arrow is C) Right turn only. This means that from the lane where the sign is positioned, you are only allowed to make a right turn. Such signs are critical for guiding drivers and ensuring orderly traffic flow.