It's either going to be A or B because a C is talking about interviewing one person and D doesn't make sense because what happens if you can't here the radio clearly or it might keep going in and out
In my opinion, I think animals shouldnt be kept in zoos because zoos dont provide good natural habitats and can put unnecessary stress on the animals. For example, zoos dont have the right facilities for hibernation animals and big animals like elephants. Zoos can be too small and limited for the elephants. Because their habitat isnt big enough to migrate, this can change their behavior and can lead to aggression. Also, zoos to people are for entertainment so animals are captured and is put into poor habitats with poor conditions and separated from other animals of their own.
The effect of natural voice is that it changes the pitch of the voice.
The answer is c i would say it kinda makes more sense.