Can I ask another study? This study include only one internal threat

Subject:PsychologyPrice: Bought3

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Can I ask another study? This study include only one internal threat. which one?1 biased assignment 2 attrition

3 instrumentation

4 history effect

5 maturation

6 pretest sensitivity

STUDY 1: Theory suggests that memory is better when the environmental conditions during the study and test phases of an experiment are the same. A researcher tested this theory with a sample of undergraduate students. During the study session, participants were shown a series of words and instructed to memorize them. Each participant completed the study phase individually in the same room with "normal" lighting. The test session took place the following day, with half the participants tested in the same room with "normal" lighting and the other half with "dim" lighting. Participants in the normal lighting condition completed a memory test with 10 questions and participants tested in the dim lighting condition completed a memory test with 30 questions. The researcher found that participants who completed the study phase and test phase in the room with "normal" lighting remembered more words than those who completed the test phase in the room with dim lighting, which supports the idea that memory is better when study and test take place in the same environment. 

I thought it was instrumentation, what do you think? Thank you so much.