In some western countries, it is believed that a person is in great danger of illness when he sneezes(打喷嚏). Therefore, people will express wishes when they hear others sneeze. The person who sneezed would apologize for that. Which situation fits western custom?

Oh, no! It’s raining. We can’t go skating on the square.         !

—I will go to the countryside to see my grandmother this afternoon, so I can’t go swimming with you.
—       

—I’m sorry I can’t help you.
—        .