Answer:
B). Both are formed by the chemical reaction between limestone and groundwater.
Step-by-step explanation:
The second statement correctly states that both Sinkhole and Cave as shown by the picture are created as a result of the chemical reaction that takes place between the groundwater and limestone. The sinkholes are characterized as the cavities that form in soluble rock by the action of water. It is often caused due to the excess withdrawal of groundwater that leads to the collapse of the surface. Similarly, the caves also form when the limestone(a rock) dissolves due to rainwater percolating CO2 through the soil which causes the reaction to take place. Thus, option B is the correct answer.