Three key factors to consider when assessing ecological validity are:

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Ecological validity refers to the extent to which the findings of a study can be generalized to real-life settings. This means that the factors that are important in assessing ecological validity are those that relate to how well the study's task and setting resemble real-life situations. Therefore, the best choices are those that focus on the task and setting, which are (D)The task, the setting and the presence of the researcher. The presence of the researcher may also impact ecological validity because it may influence participants' behavior or responses, making it less representative of what would happen in natural settings. However, it is less important compared to the task and setting in assessing ecological validity. Therefore, choice A and B are not the best, and choice C is not comprehensive enough as it only focuses on the participants' cultural background. Choice E is partially correct, but it is also less important compared to the other factors as it only relates to the replicability of the procedure, not to the extent to which it resembles real-life situations.

Three Key Factors to Consider When Assessing Ecological Validity Are