All of the options you've listed can be possible consequences of damage to infrastructure due to flooding, but here’s a breakdown of each:
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The price of local crops are lowered: Flooding can lead to oversupply if crops are damaged but still harvested, or it can alternatively decrease supply if farms are severely impacted. This means prices can fluctuate, but commonly the destruction leads to lower prices if a large amount of product is lost.
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Pollutants are spread to farmland: Flood waters can carry pollutants, chemicals, and debris from urban areas to farmland, contaminating the soil and water supply.
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Homes and businesses are washed away: Severe flooding can indeed wash away homes and businesses, leading to displacement and economic loss.
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The flow of goods is decreased or halted: Flooding can disrupt transportation networks, making it difficult or impossible to move goods to and from affected areas.
Given these consequences, one of the most direct impacts of flooding on infrastructure would be that homes and businesses are washed away. However, it's important to recognize that all of these consequences are interconnected and can occur simultaneously in the aftermath of flooding.