Column I lists the components of body defense and column II lists the corresponding descriptions. Match the two columns.
|Column I||Column II|
|A. Active natural immunity||p. Injection of gamma globulins|
|B. First line of defense||q. Complement proteins and interferons|
|C. Passive natural immunity||r. Direct contact with the pathogen that have entered inside|
|D. Second line of defense||s. Surface barriers|
|t. Antibodies transferred through the placenta|