Answer:
The correct answer is B: Greeks.
Step-by-step explanation:
In the 6th century BC, the Ancient Greeks began with their systematic studies of mathematics. One of the first world mathematicians was Thales of Miletus, and the discovery of mathematics has been attributed to him.
One of the first systematical studies was realized by an ancient mathematician Pythagoras, who questioned the basic understanding of triangles, today known as the Pythagorean Theorem.
However, a Greek mathematician, Archimedes, is considered to be the father of mathematics.