Identify the sentence that contains an error in comma usage.

Multiple choice question.

Nintendo, one of the largest gaming companies in the world, announced a new product yesterday.

The restaurant floor, my boss says, must be swept and mopped at the end of every shift.

Janice has visited London, Paris Berlin, and Madrid; she is looking forward to traveling to Barcelona next spring.

The job interview was important to Tomas, so he wore his best navy blue, wool suit.