Where should you keep your mustard after it's been opened?\nOptions:\n- jar\n- hot dog\n- hamburger\n- fast food restaurant\n- refrigerator
Let’s work this out in a step by step way to be sure we have the right answer.
refrigerator
Mustard is kept in refrigerator.

A refrigerator is used to keep things safe from getting rotten.

Mustard when kept in open can get rotten.

.

So, the final answer is refrigerator