You see a regulatory sign with a green circle around a symbol. What does the green circle mean?

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Correct answer: C. You may or must do the activity shown inside the ring

A green circle on a regulatory sign means you may or must do the activity shown inside the ring — green marks a permitted or required action, the opposite of the red-circle prohibition symbol.

Source: MTO Driver's Handbook: Signs — Regulatory sign colours

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More Sign Shapes & Colours questions

The Ontario Traffic Manual ranks sign categories by how critical they are for a driver to notice and react to in time. Which category sits at the very top of that hierarchy, even above regulatory signs like STOP and speed limit signs?
What shape and colour scheme do regulatory signs generally use?
A temporary condition sign (like a construction warning) is the same diamond shape as a regular warning sign. How can you tell them apart at a glance?
Setting aside signs with a unique shape of their own like stop and yield, what shape are most regulatory signs?

Study the rules first in the Sign Shapes & Colours guide, or browse all free G1 questions.