Which group of words in this sentence is an independent clause?

i ate dinner after i completed my homework, even though it was quite late.

a. i ate dinner

b. after i completed my homework

c. although it was quite late

d. my homework

e. was quite late

Which of the following arguments uses a non sequitur fallacy? a. if we allow students to wear caps to school, soon we'll have to let them wear gang colors. b. you should vote for sylvia for class president because everyone else on the squad is voting for her. c. regulations on motorists should be lifted because factories are a bigger source of pollution. d. the gray wolves of winter falls park should be protected because they need our support.