Which sentence does not contain any punctuation errors?
a."is the song "you're a grand old flag" traditionally sung on independence day? " john wondered.
b."you're a grand old flag' has such an upbeat melody," john observed.
c."i've always loved the patriotic song 'you're a grand old flag,'" john said.
d."could we perform 'you're a grand old flag at the concert? " john asked.

cabeza de vaca was an spanish explorer and n his long exploration of 11,000.km. from florida to present-day mexico, he went through a series of calamities and setbacks that only added to his deeds. he applied his religious creed with the humanist idea, always current and universal, that all men were equal before god and destiny without any discrimination. as an explorer, he became a slave to the tipinoga, then his shaman pointer, later and after an operation of heart to an indian (from which both came alive) he achieved stardom and became a hero followed by a crowd that professed unusual respect and admiration.

to convince americans of the importance of others.