Final answer:
The echocardiographic features of amyloidosis include all of the options listed in the question.
Step-by-step explanation:
The echocardiographic features of amyloidosis include dilatation of the ascending aorta, increased ventricular wall thickness, multivalvular regurgitation, and pericardial effusion. Therefore, the correct answer is none of the above options provided: all of the above are included as echocardiographic features of amyloidosis.