Each of the components requires careful assembly. Here, the word "Each" is a/an-

Correct answer: Distributive Pronoun.

• Distributive Pronoun:
- যে সকল pronoun একই জাতীয় একাধিক বস্তু বা ব্যক্তিকে পৃথকভাবে বুঝানোর জন্য ব্যবহৃত হয় সেগুলোকে Distributive Pronoun বলে।
- যেমন: each, either, neither ইত্যাদি।

• Pronoun হলো Noun এর পরিবর্তে ব্যবহৃত word এ কারণে Pronoun কে Substituting word বলে।
- Pronoun ৮ প্রকার যথা:
- Personal Pronoun: I, me, my, mine, we, us, our, ours, you, thee, your, yours, he, him, his, she, her, hers. it, its, they, etc.
- Reflexive Pronoun: myself, ourselves, yourself, yourselves, himself, herself, themselves, etc.
- Demonstrative Pronoun: this, these, that, those, so, such, the same, etc.
- Indefinite Pronoun: one, any, some, many, all, few, several, no one, everyone, none, someone, nobody, anybody, etc.
- Interrogative Pronoun: what, which, who, whom, whose, etc.
- Relative Pronoun: what, which, who, whom, whose, that, as, but, whoever, whomever, whatever, etc.
- Distributive Pronoun: each, either, neither, etc.
- Reciprocal Pronoun: Each other, One another.

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