Which structure represents the gaseous $SnCl_2$ molecule?

Tin has four outer electrons. Two are used in the two Sn-Cl bonds, leaving one lone pair, so gaseous $SnCl_2$ has three electron domains around tin: two bonding pairs and one lone pair. Three domains give a bent, V-shaped molecule with the bond angle pushed below 120 degrees by the lone pair, which is the structure in C. A is linear, which would need tin to have no lone pair. B has the right shape but leaves the lone pair off, so it is not the full structure. D puts two lone pairs on tin, which would need six outer electrons rather than four.