A seven-year-old child is still substituting the sound "w" for "r." What would be a quick way ...

A seven-year-old child is still substituting the sound "w" for "r." What would be a quick way for a teacher to assess whether further evaluation is needed at this time?

▸ The teacher should listen for the use of this sound in more formal, quiet, structured conversations.

▸ The teacher should present this and other sounds to the child to determine whether she can hear differences.

▸ The teacher should present this sound and ask the child to imitate it.

▸ The teacher should listen for the use of this sound in less formal, more spontaneous language during play.