PLEASE ANSWER ASAP Use your understanding of roots and word parts to select the definition that best expresses the meaning of confluence.

Tomlinson's argument recognizes that chronic diseases have many factors, involving a confluence of genetic, environmental, social,
psychological and physical events.

a) an imaginary symptom

b) an external or internal malady

c) the process of expansion or complexity

d) the act of merging r gathering at one point