Some People Must Eat a Low-Sodium Diet with No More

Some people must eat a low-sodium diet with no more than 2000 mg of sodium per day. By eating 1 cracker, 1 pretzel, and 1 cookie, a person would ingest 149 mg of sodium. If a person ate 8 pretzels and 8 cookies, he or she
Would ingest 936 mg of sodium. By eating 6 crackers and 7 pretzels, a person would take in 535 mg of sodium.
Which of the following statements is true?

A) A cracker contains more sodium than a cookie.
B) A cookie contains 71 mg of sodium.
C) A cracker contains 30 mg of sodium.
D) A pretzel contains 49 mg of sodium.