The major trading center of carthage was located in modern-day
a. turkey
b. morocco
c. algeria
d. tunisia

The ancient city of Carthage is today a suburb of Tunis- the capital of Tunisia (this is the correct answer).

Carthage was the capital of the Phoenician Empire and the Phoenicians' biggest contribution to the modern world is that they brought the Egyptian script to the Greek, and changed it on the way to an alphabet. 

Answera discharge of static electricity;

Answeroil-shale;