Lightheartedness means cheerful, carefree ect.
This means the line "The sounds of water splashing and laughter echoed in the distance; Tim's friend's had gone for a late-night swim." is the phrase that is the correct answer, since it talks about the happy actions of Tim's friends.
Answer C.
A. A healthy diet is important because it increases energy, prevents illness and promotes well being in all people.
People have got softer and want communism which is the opposite of the American Dream. The American Dream is a way of making it/ getting rich all by yourself without government interference. People want the opposite because there’s so many homeless people and people are just lazy and want the government to take care of them. In my opinion.
I would say airport, but non of them are objects.
B) To give credit to the original authors