<Li> Die Entstehung des Urchristentums . (How Primitive Christianity arose .) Munich, 1905 . 255 pp . </Li> <Ul> <Li> Albert Kalthoff . </Li> </Ul> <Li> Albert Kalthoff . </Li> <Dl> <Dd> <Ul> <Li> Das Christus - Problem . Grundlinien zu einer Sozialtheologie . (The Christ - problem . The Ground - plan of a Social Theology .) Leipzig, 1902 . </Li> <Li> Die Entstehung des Christentums . Neue Beiträge zum Christus - problem . (How Christianity arose . New contributions to the Christ - problem .) Leipzig, 1904 . 155 pp . </Li> </Ul> </Dd> </Dl>

Which of the following is associated with the first phase of the quest for the historical jesus