The correct answer is AWS CloudTrail. It’s designed to capture and record all actions taken within an environment, like user accesses and API activities, which is crucial for auditing and compliance purposes. While Amazon CloudWatch provides monitoring and logging capabilities, it is not primarily used for recording API call history. AWS Security Hub focuses on security checks and consolidations of findings from various services but does not specifically track user actions or API calls. Amazon Inspector offers automated security assessment services and does not deal with logging and tracking of all interactions within an environment. Therefore, CloudTrail is the best fit for the requirement.