Dr. joseph thinks most people are generally trusting of strangers. he did a study at his university in the united states to test this idea, and the results confirmed his hypothesis. dr. joseph is discussing the results of this study with dr. ming, a friend who is a psychology researcher in china. dr. ming thinks people in eastern cultures, such as china, are less trusting of strangers than are people in western cultures, such as the united states. dr. joseph and dr. ming decide to run a second study in which they have a group of participants in china and a group of participants in the united states both complete the task used in dr. joseph's study. this second study is a . meta-analysis replicationb. conceptual replicationc. direct replicationd. replication-plus-extension