A limitation of research investigating massed vs. distributed practice is: The lack of a retention or transfer test Retention intervals that are not sufficiently long Too many practice trials Inappropriate tasks to be learned

Respuesta :

The common problem of the research investigating the massed vs. the distributed practice is the lack of a retention or transfer test.

The research which intends to investigates the massed refers to one that  targets a large population at a time  

The research which intends to investigates the distributed refers to one that target the different section of the large population

However, the common limitation of the two research is lack of a retention or transfer test in the investigation.

Therefore, the Option A is correct.

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