This is the wrong subject however, grunting would be the answer you're looking for.
The correct answer to this open question is the following.
According to your question, there are only two parts to be answered, a) and b).
Being that the case, we can comment on the following.
A) This is an observational study and not an experiment because the research was only limited to observation, participants never receive any kind of treatment or another interaction to experiment with them.
B) Who were the subjects of the study?
The subjects of this study were women aged 65 and older who were tracked for several years. The observation revealed that those women who had a vitamin B12 deficiency were twice as likely to suffer severe depression as those who did not.
So, according to the American Journal of Psychology, these were the women observed during the study. There were no more experiments, interactions, or activities applied to them in order to consider it an experiment.
Let's remember that in order to consider an experiment as such, there has to be another component of the study, and the experimental part of it that has to be tested and proved passing the scientific method to conclude in something valid.

Social engineering is a technique used to exploit human self-satisfaction in order to gain access to personal access, access, or other valuable assets. In the narrower context of cybercrime, 'human hacking' seeks to get unsuspecting users to share secrets, spread malware, or grant access to restricted systems.
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Explanation:
Social engineering (English: Social engineering or abbreviated soceng) is the psychological manipulation of a person in carrying out an action or revealing confidential information. Social engineering is generally done by telephone or the Internet.
<h3>I hope this helps :) </h3>
I'd say the answer would be C. Worked in jobs outside the home in higher proportions than earlier times
Answer:
The Mayans religion involved several aspects of nature, astronomy and rituals. Most Gods represented a form in nature, for example, Sun God, Kinih Ahous, or Maize God, Yum Kaax. These were used during their religious rituals. Similar to the Egyptians, the Mayans built Pyramid like temples for religious reasons.
Explanation:
please mark this answrer as brainliest