Which of the following reference materials would be most appropriate for gaining information for a research paper on a complex process?
an index
a biography
the encyclopedia britannica
an almanac

What makes the following sentence unclear? i had hoped to finish the race and win a medal, but i didn’t. a) nothing. the sentence contains no errors. b) there is no independent clause so the sentence is incomplete. c) it’s a simple sentence and doesn’t need a comma. d) there are two possible meanings to the sentence.