Why did Greek colonies spread throughout the Mediterranean region?

Question

a.Tyrants created many of them.

b.Population pressures caused them to develop.

c.Persia attacked mainland Greece.
d.Pericles founded them.

i think it is c. am i correct

Answer 1

No.

http://www.ancient.eu/Greek_Colonization/

Answer 2

so it is B?

Answer 3

I'll give you a chance to study the website I posted before I respond again.

Answer 4

B is correct.