Final answer:
The National Program of Cancer Registries (NPCR) is the organization responsible for maintaining the NPCR-EDITS metafile for SEER Program participants to test their data against cancer registry standards.
Step-by-step explanation:
Which organization maintains the NPCR-EDITS metafile written for the Surveillance, Epidemiology and End Results (SEER) Program participants to use to test their data against SEER cancer registry standards? The correct answer is 1) National Program of Cancer Registries (NPCR). The NPCR is a division of the Centers for Disease Control and Prevention (CDC) and works with SEER to improve cancer data. This organization supports cancer registries in collecting data that are complete, accurate, and timely for use in a variety of public health applications.