According to ISTQB Syllabus.

Common test metrics include:
• Percentage of planned work done in test case preparation (or percentage of planned test cases
implemented)
• Percentage of planned work done in test environment preparation
• Test case execution (e.g., number of test cases run/not run, test cases passed/failed, and/or test
conditions passed/failed)
• Defect information (e.g., defect density, defects found and fixed, failure rate, and confirmation test
results)
• Test coverage of requirements, user stories, acceptance criteria, risks, or code
• Task completion, resource allocation and usage, and effort
• Cost of testing, including the cost compared to the benefit of finding the next defect or the cost
compared to the benefit of running the next test

Answer is D