Which of the following statements about primary (deciduous) teeth is accurate?

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The maxillary primary first premolar completes calcification by the time of birth.The mandibular first molar emerges around 18 months of age.Primary teeth crowns have a more yellow hue compared to permanent teeth.Development of primary teeth begins during the tenth month of fetal life.

Explanation

Option B is correct because the mandibular first molar typically erupts at approximately one and a half years old. The maxillary primary first premolar does not complete calcification at birth, primary teeth crowns are generally whiter than permanent teeth, and the initiation of primary dentition occurs earlier than the tenth month in utero.