(Solved): Harold (the wizard) has two kinds of elemental scrolls: teleportation spells ...

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Harold (the wizard) has two kinds of elemental scrolls: teleportation spells and sleep spells. Harold wishes to arrange his 8 different teleportation spell scrolls and his 7 different sleep spell scrolls together on the same shelf of his mystic bookcase. In how many ways can this be accomplished if all the teleportation scrolls must be kept together? A. (9!) (8!) B. $$(9!)(7!)$$ C. $$(8!)(7!)$$ D. $$(8!)(8!)$$ E. 15 !