The recommendation which the nurse should provide a parent who asks when it is safe to transition a toddler from a crib to a bed is when the child reaches 35 inches he/she should sleep in a bed.
This refers to a small bed frame which has high sides for a child and the setup is to ensure the child doesn't move about for safety reasons thereby protecting the toddler.
When the toddler is more mature and has attained a height of about 35 inches he/she should sleep in a bed. This is because the child may strangle or get stuck in between the sticks of the crib.
This is therefore the reason why attaining such height and development was chosen as the correct choice.
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