5. Which of the following would be a good example of someone doing something "once in a blue moon"?

a.)Mary likes to go to the mountains every weekend.
Mary goes to the mountains once in a blue moon.

b.)Tom rarely remembers to take out the trash. Tom takes out the trash once in a blue moon.

c.)Cindy hates to wash the dishes. Nevertheless, she does it every day. Cindy washes the dishes once in a
blue moon.

d.)Ming sometimes forgets to do his homework. Ming forgets to do his homework once in a blue