Option 1 -> "Due to" is a prepositional phrase that correctly introduces a noun phrase as the reason for something.
Option 2 -> "From" doesn't grammatically work to indicate causation in this context.
Option 3 -> "Because" is a conjunction that requires a clause (subject + verb), not a noun phrase. It would need to be "because of."
Option 4 -> "Since to" is not a grammatically valid phrase in English.
Hence, Option 1: due to -> "Due to unforeseen circumstances" is the standard idiomatic expression to indicate that something happened as a result of unexpected events. It correctly connects the cancellation to its cause -> correct