Suppose your colleague, Marco, says that he will be in Chicago or St. Louis on Friday. On Friday morning, your boss says, "Where is Marco? He’s supposed to be in Chicago, but he’s not there." You reply, "If he’s not in Chicago, then he’s in St. Louis." Is your argument valid?

Which of the following statements is true about social anxiety disorder? social anxiety disorder tends to develop in early adulthood. social anxiety disorder often co-occurs with mood disorders and other anxiety disorders. social anxiety disorder is relatively rare, with a lifetime prevalence of about three percent in the united states. lesser than 30 percent of adults with social anxiety disorder report humiliating experiences that contributed to their symptoms.