One effective way to develop your own personal writing style is to
oa) avoid uncommon punctuation.
ob) read the works of expert authors.
oc) restrict your language as much as possible.
od) keep the same set of characters in your writing.

How is president obama using an appeal to reason, or logos, in this excerpt? by explaining why each person must work hard in order to succeed by explaining why working together is necessary for success by explaining why attempts at working together in the past failed by explaining why each person must look out for him or her self