Mild Crowding of the Permanent Mandibular Incisors May Resolve After

Mild crowding of the permanent mandibular incisors may resolve after the age of 10 for which of the following reasons?

A) The permanent mandibular incisors are only slightly larger in size than the primary mandibular incisors. Normal growth of the anterior region of the mandible provides more than adequate room for the permanent incisors by the age of 12.
B) The presence of primate space distal to the mandibular canines allows space for the mandibular canines to move distally, creating more room for the mandibular incisors and alleviating mild crowding problems.
C) The tongue will force the permanent incisors facially, creating adequate room to resolve any problems of crowding.
D) It is not possible for even mild crowding of the permanent mandibular anterior teeth to resolve at this time because adequate growth of the anterior region of the mandible has not occurred.