Answer to previous question was C.
Many environmental impact reports end by resolving earlier uncertainty with clear benchmarks and a timeline for meeting them. But the agency’s draft report lists possible measures without committing to targets, repeatedly noting that the data are “still being evaluated” and declining to define what would count as success. The effect is to make the report’s promise of accountability not merely postponed but ____.
Which choice completes the text with the most logical and precise word or phrase?