The answer is: [D]: "os" .
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The opening for the "cervical canal" is called the:
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→ "cervical os" .
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Note that: "os" — means "mouth" in Latin; which is similar to "opening' .
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If that ever happens (as a student) the students will go and hide in a corner where the bad people can’t see them in the class. And also they NEED THERE LIGHTS TURN OFF. If it is turn on there is a 99.9 chance that the people will come in your classroom. SO TURN THE LIGHTS OFF AND HIDE IN A CORNER WHERE THE POEPLE CANT SEE YOU