The tigris and euphrates rivers flow to the a. north / black sea b. west / mediterranean sea c. south / persian gulf d. southwest / dead sea

The Tigris and Euphrates rivers flow south to the Persian Gulf.

Explanation:

The 'Tigris and Euphrates rivers' flow in Iraq which lies in northwest of the Persian Gulf. These rivers are most famous for being the lifeline of the ancient Mesopotamian civilization. The 'Persian Gulf' is a sea covered by land on almost all the sides with an opening in the southeast right above UAE where the waters from the 'Persian Gulf' make union with the waters from the 'Gulf of Oman'.

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The us is first  the  u.s. economy  remains the  largest in the world  in terms of nominal  gdp. however, the  u.s. economy  loses its spot as the number one  economy  to china when  measured  in terms of  gdp  based on ppp. in these terms, china's  gdp  is $23.19 trillion exceeds the  u.s. gdp  of $19.42 trillion