The correct answer is A.
It's not B because the text tells that everyone who pays this value-added tax pays the same (19% of the cost of the product minus the already paid value-added taxes). This rate is variable depending on the number of intermediaries and the amount that they already paid.
It's not C because the text does not say anything about the use of the taxes money by the state.
D isn't correct because the text also includes taxes paid by other intermediaries like hose manufacturers and retail stores.