Answer:
C) Mesosaurus fossils
Step-by-step explanation:
Land bridges are path between two continents which were there millions of years ago but are now under sea. During ice age these paths were formed when sea water dried up due to formation of ice at poles. Mesosaurus are extinct species of reptiles which inhabitated south Africa and southern part of south america two continents separated by Atlantic ocean. This proved that earlier these continents were part of a single landforms.