B. calls - This is a habitual action that Mary does on Fridays.

B. are you laughing - Has Jim been telling - The first part is a question about a current action, and the second part is a question about an action that has been happening for some time.

B. is happening - This is a question about something that is happening right now.

C. hasn't rained - This is a statement about something that hasn't happened in the past.

B. is wearing - This is a description of what the man is doing right now.

C. is washing - has just repaired - The first part describes an action that is happening now, and the second part describes an action that has just finished.

C. is beginning - This is a statement about something that is starting to happen now.