2. Arch length available anterior to the mandibular second primary molars............... after __ their eruption does not increase b. increase c. disappear d. protrude

The correct answer is:<br /><br />b. increase<br /><br />Explanation: The arch length available anterior to the mandibular second primary molars typically increases after their eruption. This is because the eruption of these molars can create additional space in the dental arch, allowing for further growth and development of the teeth and jaw.