Step 1: Read what is being asked.
I look for the sentence that describes the episode Morley's groups saw.
Step 2: Go back to the passage.
The passage describes the show as a British television news magazine that assessed the money effects of the government budget on three families. I compare each choice to that description.
Step 3: Test the choice "Planning annual budget for families" (option 1).
Not right. It talks about families making a plan, while the show covered what the government did.
Step 4: Test the choice "Life challenges of three families" (option 2).
Not right. It changes the topic to hardships of life, which the passage never states.
Step 5: Test the choice "Government development policies on families" (option 3).
Not right. It brings in development policies, a topic absent from the passage.
Step 6: Test the choice "Economic consequences of government's annual budget on three families" (option 4).
Right. It carries both ideas, the budget and its economic effect on the three families.
Final Answer:
Option 4 restates the passage description of the episode.
\[ \boxed{\text{Option 4}} \]