When I was afraid is the subordinate clause because "that is the time" can stand by itself and can be recognized as a independent clause. I believe that the subordinate clause would fall under the adjective clause family, mainly because "when I was afraid" directly refers to "time", which is a noun.
Answer:
All I know is it isn't D. I just did the quiz and got it wrong. If I figure out the right awnser I will tell you.
Influence by other languages
isolation
poetry
influence of social or religious groups
age of the person using language
educational system
