When using work sampling, the times of day to collect data samples are selected at random over the length of the study

The more dissimilar the contexts across which its businesses compete, the harder it is to manage

a firm's portfolio and to create value through economies of scope. Indicate whether the statement is true or false

Which sentence is punctuated correctly?

A) Marriage therapists often stress an important skill in counseling sessions; that is, effective communication. B) Marriage therapists often stress an important skill in counseling sessions, that is; effective communication. C) Marriage therapists often stress an important skill in counseling sessions, that is, effective communication.