If $$a^{2} + b^{2} + c^{2} = 6.25$$ and (ab + be - ca)= 0.52. what is the value of (a + b + c). if (a + b + c) < 0 ?

A

$$\pm2.7$$

B

-2.7

C

-2.8

D

$$\pm2.8$$