Final answer:
A TTE is best at identifying cardiac structural abnormalities such as heart valve problems or abnormal heart chambers.
Step-by-step explanation:
A TTE, or Transthoracic Echocardiogram, is a test that uses sound waves to create images of the heart. It is best at identifying cardiac structural abnormalities such as heart valve problems or abnormal heart chambers. It can also provide information about blood flow and heart function. Therefore, the correct answer is B) Cardiac structural abnormalities.