According to the text, -you notes for presents should be sent the day after you received them by the middle of the next month within a week

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.