Someone please just help -

which of the following accurately describes how ideas from some early civilizations diffused to other areas?
A. Major contributions from Egypt and Mesopotamia diffused through migration patterns in Africa.
B. Exploration, mostly by sea, helped spread major contributions of India and Mesopotamia to others.
C. Significant ideas from Mesopotamia and China spread mostly through established trade routes.
D. Contributions from ancient Egypt and China spread to other regions mostly through warfare.