Question

why is desalination difficult to achieve? its expensive it isnt fun its impossible it doesnt work

Explanation:

Desalination (removing salt from water) is difficult mainly due to high costs of technology, energy, and infrastructure. "It's expensive" aligns with this. "It isn't fun" is irrelevant, "It's impossible" is false (desalination is done), and "It doesn't work" is also false (desalination systems function).

Answer:

A. It's expensive