According to the Text, What Should One Remember When Thinking

According to the text, what should one remember when thinking about all the conveniences and equalities people did not have in Canada in 1900?

A) One should remember that social change is a process with no positive consequences.
B) One should remember that social change is a process with no negative consequences.
C) One should remember that social change is a process with only positive consequences.
D) One should remember that social change is a process with only negative consequences.
E) One should remember that social change is a process with negative as well as positive consequences.