Answer:
The songs will become more similar to each other.
Explanation:
Speciation may be defined as the process of formation of new species by the external or internal force. Two main types of speciation are allopatric speciation and sympatric speciation.
Two frog population belongs to the same species that lives two neighboring lakes. The irrigation makes the pond wetter and connect the two species. The songs of the two species tends to be more similar in both species s singing is genetic basis and allows the mating between two species.
Thus, the correct answer is option (c).