Topic: verb (ক্রিয়া),

Best Answer Explained in Below-:

The phrase "These ____ books" requires a word that can accurately link the demonstrative "these" to the noun "books." In English grammar, "these" is a plural demonstrative pronoun, indicating more than one item. Therefore, the verb or phrase that follows must also agree in number, meaning it should also be in the plural form.

Let's analyze the options:

A) **are** - This is the correct answer. "Are" is the plural form of the verb "to be," which connects the subject "these" with the noun "books." So, "These are books" is a grammatically correct statement.

B) **am** - This is incorrect because "am" is the singular form of "to be," used only with the first person singular subject "I." It does not agree with the plural "these."

C) **is** - Although "is" is also a form of "to be," it is the singular form used for singular subjects, such as "this" or when referring to one item. Thus, "These is books" is grammatically incorrect.

D) **is a** - This option introduces an article "a" which is singular, and again does not match the plural subject "these." Therefore "These is a books" does not work.

In summary, only "are" ensures grammatical agreement and correctness, making it the appropriate choice to complete the phrase.