Henry molaison (h. m.) had his hippocampus removed in both hemispheres. it was found that molaison could learn new procedural tasks (e.g., mirror tracing) with the same ability as typical control participants. however, he could not remember completing the task. this suggests that:

It's a Case Study cause, case study is also a type of research. Case study is a detailed and in-depth examination of a particular case. Here, HM's case has been examined deeply by the researchers through many methods. So, the correct answer is Case Study.

The other options are not correct cause, it's not an Archival research. In archrival research the primary source of data is from archival records. So, here the primary source of collecting data is not from archival data. Whereas, in case study archival data is also required.
And certainly it is not an experiment because there is nothing about manipulating Or measuring any variables. And survey also not the correct answer because survey is a method of collecting data from a particular group of people. Here the research is all about one individual.

Learn more about HM's here :-

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