How did Ah Sing and Chin try to hide their fear from one another?

a.
Ah Sing and Chin tried to hide their fear from one another by washing the dishes and getting ready for the day.

b.
Ah Sing and Chin tried to hide their fear from one another by cleaning up the broken glass.

c.
Ah Sing and Chin tried to hide their fear from one another by making jokes.

c. Ah Sing and Chin tried to hide their fear from one another by making jokes.