Angelo has mild autism spectrum disorder and participates in an applied behavioral analysis program. Each day in school, he is allowed to decide the order in which he will work on his tasks, although the day’s tasks have been selected for him, and which of several possible rewards he would like when he has completed each task. This approach is most consistent with theory

self-determination                                                

Explanation:

Self-theory determination: In psychology, the term "self-determination theory" is also written as "SDT", and it was proposed by the work of psychologists named Richard Ryan and Edward Deci.

Self-determination theory is described as a "macro-level theory" related to human personality and motivation that is mainly focused on human beings "innate psychological needs" as well as "inherent growth tendencies". It is highly concerned or influenced with an individual's motivation that is behind different choices he or she makes in the absence of any external interference and influence.

In the question above, the given approach is most concerned with self-determination theory.