Which tools are commonly used for blow drying hair?

The correct choice highlights the essential tools used in the process of blow drying hair. Round brushes, flat brushes, and a blow dryer are integral for achieving various hairstyles and effectively drying hair.

Round brushes are particularly useful for creating volume and curls during the blow drying process. As the hair is dried, the round shape of the brush can be used to lift hair at the roots, giving an airy finish, or to curl the ends for a softer look. Flat brushes are beneficial for smoothing out hair, allowing for a more sleek and straight appearance, particularly when dealing with longer hair. The blow dryer is, of course, the primary tool used for drying hair, and its heat and airflow work in conjunction with the brushes to style hair as desired.

Other options include tools that serve different purposes in hair styling but are not primarily associated with the blow drying process. While combs, curling irons, hairpins, heating caps, and scissors are all important in various aspects of hairstyling, they do not play significant roles specifically in blow drying hair. This makes the first option the most relevant and effective answer to identify the tools commonly used for blow drying.