Answer:
A. Isthmus of Panama
Step-by-step explanation:
Isthmus is the landform which connects the two mass continents through narrow strip. "Isthmus of Panama" is the middle American land between the "Caribbean Sea and Pacific Ocean". Continent Shelf is the one of the landform feature in the Oceanic landforms. Suez canal is the artificial sea route to Asia which is built by the European powers. "Sinai Peninsula" is the landform in Egypt which connects the landform between Europe and Asia.