Answer: hope this works :)
I would go for option 4: The wheelbarrow is needed for the farmer to work
Step-by-step explanation:
The wheelbarrow is a rather mundane item that people may overlook, and by focusing so intently on it, the poem might be suggesting the value of appreciating these simple items that make life easier. The red wheelbarrow can also be seen as a symbol for perception.
I would go for option 4: The wheelbarrow is needed for the farmer to work.
I say this because so much depends on it. This is a quote from the poem 'so much depends upon a red wheel barrow' the farmer needs it to do his work.