Suppose you were writing a summary of the article. Which would be most important to put in the summary?

Some evidence suggests that phobias can run in families.
Phobias can cause distress for people, but they are fully treatable.
There are a number of reasons that phobias can develop.
Phobias can focus on one object, or they can be more complex.

It would be most important to include the fact that phobias can cause distress for people but are fully treatable.