The effectiveness of a review process can be measured by how well it detects and removes defects from the work products being reviewed1. One of the metrics that can indicate the defect detection capability of a review process is the number of defects found in production for each module that was reviewed2. This metric can show how many defects escaped the review process and were not detected until the software was deployed. A lower number of defects found in production means a higher review effectiveness. Therefore, option A is the correct answer. Option B is incorrect because the development language used to create each module that was reviewed is not relevant to the review process effectiveness. Option C is incorrect because the elapsed time between each module's review and its corresponding deployment into production is not a measure of defect detection or removal, but rather a measure of development speed or efficiency. Option D is incorrect because the business criticality of each module that was reviewed is not a measure of defect detection or removal, but rather a measure of risk or priority. References: 1: ISTQB Advanced Level Test Manager Syllabus, Section 2.3.2 2: Software Testing Metrics: What is, Types & Example