Flower and Hayes regarded which one of the following skills as 'problem-creating and solving skill' ?

The correct option is Writing.

In cognitive psychology and educational research, Linda Flower and John R. Hayes developed a prominent cognitive process model of writing in 1981. According to their model, writing is not merely a passive or linear process of translating thought into text; rather, it is a complex, active "problem-creating and problem-solving skill."

During the writing process, writers construct a mental representation of the task, continuously create sub-goals, diagnose issues in their draft, and dynamically revise their goals and text to solve rhetorical and cognitive problems.