My great English teacher Mr. Anderson had a simple rule to remember about conjuctions ("AND") in multiple choice tests:

The whole thing is not true unless each conjunct is true. That is, "a AND b" isn't true unless BOTH a and b are actually true.

Of course, this is the definition of "AND", yet surprisingly it is easy to be fooled by those multiple choice tests with lots of "ANDs" in the multiple choices. Often one answer seems so temptingly to be right, expect for one little conjunct which is wrong. In those cases, one must resist the temptation and find another choice.