<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A study is conducted in a hospital to estimate the prevalence of handwashing among healthcare workers. All of the hospital staff members are informed that the study is being conducted for 1 month, and the study method will be a passive observation of their daily routine at the hospital. A total of 89 medical staff members give their consent for the study, and they are followed for a month. This study could most likely suffer from which of the following biases?? A: Confounding bias, B: Observer-expectancy bias, C: Berksonian bias, D: Attrition bias, E: Hawthorne effect,  <response>: This is a question asking about potential biases in an observational study design. The study is observing handwashing behaviors in hospital staff. Since the staff are informed that they are being observed, they may change their behavior during the study period. This could lead to the Hawthorne effect, where subjects modify their behavior simply due to the fact that they know they are being studied. The other answer choices describe biases that are less relevant to this particular study design.E: Hawthorne effect 