The correct answer is: Option C. Yelled in outrage.
Conventional language consists in the set of communication tendencies that are expected by people to be used on a certain situation. In other words, it is what people expect from others to communicate with.
In this case, the phrase "yelled in outage" is one that anyone familiar enough to the english language would expect to hear in the example situation - considering the use of slangs is not conventional at all.
