The set of values of $$a$$ for which $$\lim_{x \to a} ([x-5] - [2x+2]) = 0$$, where $$[\zeta]$$ denotes the greatest integer less than or equal to $$\zeta$$ is equal to

A

$$(-7.5, -6.5)$$

B

$$(-7.5, -6.5]$$

C

$$[-7.5, -6.5]$$

D

$$[-7.5, -6.5)$$