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Algebra Difficulty 1.0 Junior Find the answer United Kingdom

In the equation on the right there are five empty squares. Sanja wants to fill four of them with plus signs and one with a minus sign so that the equation is correct. $6\ \square\ 9\ \square\ 12\ \square\ 15\ \square\ 18\ \square\ 21 = 45$ Where should she place the minus sign?

(A) Between $6$ and $9$ (B) Between $9$ and $12$ (C) Between $12$ and $15$ (D) Between $15$ and $18$ (E) Between $18$ and $21$

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