The risk in the question is interception during transmission. Encryption directly protects transmitted data by converting readable information into unreadable ciphertext unless the recipient has the proper decryption key. Traffic padding also helps reduce interception-related exposure by inserting additional or dummy communication patterns, making traffic analysis more difficult. Edit checks are application controls used to validate accuracy, completeness, format, or reasonableness of data; they do not prevent interception during transmission. Structured data format supports standardized processing and compatibility, but it does not protect data from being captured or read by unauthorized parties. Internal auditors reviewing electronic data interchange should distinguish between confidentiality controls, integrity controls, and processing controls. For transmission interception risk, encryption and traffic padding are the relevant control techniques. Therefore, Option A is correct.