Final answer:
A written statement of a research study and its results is known as a Research report, which includes research methods and results, and is essential for communication within the scientific community. The correct option is D.
Step-by-step explanation:
A written statement of a research study and its results is known as a Research report. This document typically includes the research methods, results, and discussion of the findings.
Scientists communicate their results through research reports which are often subjected to a peer-review process before publication in scientific journals, ensuring the validity of the research.
Research reports are valuable in the scientific community as they provide a detailed account of the study, allowing others to review and potentially replicate the findings. This critical communication step is integral for progress in scientific fields, ensuring that knowledge is shared, scrutinized, and built upon. The correct option is D.