This, that, these, those are-

Correct answer: Demonstrative Pronoun.

• Demonstrative Pronoun: যেসব pronoun কোনো নির্দিষ্ট ব্যক্তি বা বস্তুর পরিবর্তে বসে সেই ব্যক্তি বা বস্তুকে নির্দেশ করে, তাদেরকে Demonstrative Pronoun বলে।
- A demonstrative pronoun points to specific things or people. The main demonstrative pronouns in English are: this, that, these, and those.

• Pronoun:
- Pronoun হলো noun এর পরিবর্তে ব্যবহৃত word.

• Pronoun ৮ প্রকার।
1. Personal pronouns (he, they).
2. Demonstrative pronouns (this, these).
3. Interrogative pronouns (which, who, where, what).
4. Indefinite pronouns (none, several).
5. Possessive pronouns (his, your).
6. Reciprocal pronouns (each other, one another).
7. Relative pronouns (Who, which, where, what).
8. Reflexive pronouns (itself, himself).

Source:
1. A Passage to the English Language by S.M. Zakir Hussain.
2. Website English Wizard by Saleh Ahmed.