Which is the most formal of three options below. mad stewing quite displeased and upset or none above?

Here's why:

* Mad is informal and colloquial.

* Stewing is also informal and suggests a state of emotional turmoil rather than a formal assessment.

* Upset is more formal than "mad" but still carries a slightly emotional connotation.

* Quite displeased conveys a sense of dissatisfaction in a more formal and objective manner.

If you want to be even more formal, you could consider options like "dissatisfied" or "unimpressed."