Final answer:
The correct spelling of the word is 'This', which is a demonstrative pronoun or adjective in English.
Step-by-step explanation:
The correct spelling for the word in question is A) This. The provided options B) Thiz, C) Thizz, and D) Thizs are incorrect. In English, the spelling 'this' refers to something close to the speaker or being mentioned within the context.
The word is used as a demonstrative pronoun or as an adjective to specify a particular thing or person that is being considered.