$$\overrightarrow{P} = 2i - 3j, \overrightarrow{Q} = -3i + 4j - 2k$$, and $$\overrightarrow{R}$$ are in equilibrium, if $$\overrightarrow{R}$$ is

A

$$-i - j + 2k$$

B

$$i - j + 2k$$

C

$$i + j + 2k$$

D

$$i - j - 2k$$