He has become more aware of his surroundings and conquered his fears
It would be the last one, as Ology is used in many "studies."
ex. Biology, Dermatology, Technology, Angelology.
1.) We receive no formal training in listening
2.) Speaking as a skill is seen as more important than listening
3.) Filters keep us from listening without bias
Answer: complex
Explanation: this sentence is complex because it contains both a dependent and an independent clause.