Look at this series: 1.5, 2.3, 3.1, 3.9, . . .
What number should come next?

C. 4.7

Complete analogous pair - Ocean : Water : : Glacier : ?

B. ICE

Complete analogous pair - Ice : Coolness : : Earth : ?

D. GRAVITATION

Carnivorous : Tiger : Wolf

D. STUDENT : BOY : GIRL

Complete analogous pair - Pork : Pig : : Beef : ?

C. COW