Use Testlet D to Answer the Following Questions

Use Testlet D to answer The Following questions
TESTLET D
The director of a local nursing home has approached a public health dental hygienist to design an oral health protocol for the 300 residents. Currently, a registered nurse is performing the intake oral examination, and the nursing home has an "on call" dentist. The majority of residents are partially edentulous, have partial removable dentures, and require assistance with daily hygiene practices. The caregivers state that the residents have severe halitosis, trouble eating, and frequently lose their removable partial dentures. The dental hygienist observes that the caregivers are neglecting daily oral hygiene care and are not expected to conduct oral cancer screenings. On the basis of these observations, the dental hygienist determines to carry out oral hygiene and oral cancer screening of all residents and introduce an educational component to be used by the facility's caregivers and interested family members. Flashlights, disposable mouth mirrors, masks, gloves, protective eyewear, and 2 × 2 gauze are required for the screening. The educational component will consist of six weekly 1-hour sessions and will focus on knowledge of the risk of oral cancer, the benefits of periodic oral screenings, recognition of signs and symptoms of common oral lesions, daily oral hygiene care, and other oral health procedures to meet the needs of the residents. A pretest and post-test will be used to evaluate change in knowledge.
-What type of study is represented by evaluating the change of knowledge as a result of the educational component?

A) Case control
B) Correlational
C) Pretest/post-test
D) Time series