Prepositions can be simple one-word items or complex multi-...
(__) "In spite of" is considered a complex preposition that functions grammatically in the same way as the simple preposition "despite".
(__) "Regarding" and "concerning" are participles that have evolved to function as simple prepositions.
(__) "Because" is a preposition, whereas "because of" acts as a subordinating conjunction introducing a clause.
(__) "Due to" traditionally functions adjectivally (following "be"), while "owing to" functions adverbially, though this distinction is blurring.
The correct sequence, from top to bottom, is: