Final answer:
The option that is not one of the types of deviant reactions to strain identified by Robert Merton is 'a. Revolution.'
Step-by-step explanation:
The option that is NOT one of the types of deviant reactions to strain, as outlined by Robert Merton, is a. Revolution. Merton's strain theory describes how people adapt to the discrepancy between socially approved goals and the means available to achieve them.
The five modes of adaptation he identified are conformity, innovation, ritualism, retreatism, and rebellion. 'Revolution' is not considered a separate mode of adaptation within Merton's strain theory.