Which of the following non-metal is lustrous? 

Iodine 

The correct answer is option 1. Iodine.

Among the options provided, iodine is the non-metal that is lustrous. Iodine is a solid non-metal element that can exhibit a shiny, metallic luster when it is in its crystalline form. Solid iodine consists of shiny, dark violet crystals that can appear metallic when polished. This luster is more noticeable under certain conditions, such as when iodine crystals are finely ground or in the form of iodine vapor. So, the correct answer is Iodine.