Deep breathing exercises are an effective way to deal with
a. anxiety
b. frustration
c. fear
d. all of the above

d. all of the above

Explanation:

Deep breathing helps us calm agitation, stress and anxiety. Breathing well to live better is a principle of physical and mental well-being that demands our attention between the rush and the pressures with which we live.

Most of us breathe quickly and superficially, underusing the capacity of our lungs, which barely expand. In a normal state we breathe between 17 or 18 times per minute. However, when we suffer from anxiety or stress, the number of that respiratory rate skyrockets, and can even reach 30 breaths.

Breathing is one of the few bodily functions that we do both voluntarily and involuntarily. It constitutes a great opportunity for control over our body, improving, if we exercise this control intelligently, in quality of life.

When we take a deep breath, but especially slowly, we get oxygen to truly reach the cells and not lower the level of blood CO2

Benefits of deep breathing:

- It would improve the cellular metabolism of our body.

- We would better manage stress and anxiety.

- We would sleep better.

- Digestions would be less heavy.

- We would feel less muscle pain, less headaches and migraines.

- We would concentrate better on our tasks.

- It would improve our postural axis and we would have less back pain.

- We would learn to be more focused on "the here and now."

70 % i think is the answer.