Final answer:
Among the options listed, Early Intensive Behavioral Intervention (EIBI) combines other naturalistic techniques to form an intervention strategy.
Step-by-step explanation:
Among the naturalistic approaches listed, the option that combines other techniques to form an intervention strategy is Early Intensive Behavioral Intervention (EIBI). EIBI is a comprehensive treatment for young children with autism that incorporates various naturalistic techniques such as Natural Environment Teaching (NET) and Functional Communication Training (FCT).