Match the following definitions with their one-word substitutes.

A. A cold-blooded vertebrate animal that is born in water and breathes with gills   i. Extempore

B. A vigorous campaign for political, social, or religious change                             ii. Panacea

C. Spoken or done without preparation                                                                   iii. Crusade

D. A solution or remedy for all difficulties or diseases                                             iv. Amphibian