Which of the following, according to paragraph 3 was NOT a principal method of launching a ship

A．To outline history.
B．To outline modern practices.
C．To explain traditions.
D．To explain a birth cycl

A．Slater's arrival in America.
B．New York and the Almy and Brown mill.
C．The first three months and achievement of a partnership.
D．Slater's understanding of the spinning process.