In Hodson's (2007) Cycles Approach to Target Selection, the Criterion

In Hodson's (2007) cycles approach to target selection, the criterion for moving on from one primary target pattern to another primary target pattern is a:

A) time-based criterion whereby each stimulable phoneme within a pattern is targeted for 60 minutes.
B) performance-based criterion whereby each stimulable phoneme is targeted until it is 50% correct in conversational speech.
C) flexible criterion, based on a child's motivation and interest.
D) performance-based criterion whereby each primary phonological pattern is targeted until it is occurring < 40% of the time in conversational speech.