Which of the following caused the Phoenicians to rely upon the sea for travel and trade? A. Mountains to the east blocked easy access to east and left little land for farming.

B. Syrian enemies to the north and east threatened to attack their trade routes.

C. They were unable to cross the Tigris River going east.

D. The Arabian desert blocked easy access to the southern trading partners.
PLS HELP ＞︿＜