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The correct answer id d.: When riding a bike, a helmet and other protective gear should be worn..
The passive phrase in this sentence is "be worn" or "should be worn" and you can see that it's a passive because it has a form of "to be" plus a past tense of the verb.
The passive phrase in this sentence is "be worn" or "should be worn" and you can see that it's a passive because it has a form of "to be" plus a past tense of the verb.
The correct answer is 'd' because the agent performing the action isn't mentioned.In instructions and advice,it isn't necessary