Rationale
We thought the movie was very good.
The word "we" is the appropriate subject pronoun that correctly completes the sentence, as it indicates the group of people expressing their opinion about the movie.
A) "Us" is an object pronoun, which cannot function as the subject of a sentence. In standard English grammar, "us" would be used in contexts where the pronoun is receiving the action rather than performing it, making it an incorrect choice for this sentence.
B) Correctly serving as the subject pronoun, "we" indicates the group of individuals expressing a positive opinion about the movie. It is grammatically accurate and maintains the proper subject-verb agreement with the verb "thought."
C) "Them" is also an object pronoun, similar to "us." It cannot act as the subject of the verb "thought." This makes it an unsuitable choice for completing the sentence, as it would create a grammatical error.
D) "Ourselves" is a reflexive pronoun used for emphasis or to indicate that the subject and the object are the same. However, in this specific context, it does not serve as the subject of the sentence and therefore does not fit grammatically.
Conclusion
Choosing "we" correctly completes the sentence and maintains grammatical integrity, as it is the appropriate subject pronoun. The other options fail to fulfill the subject requirement, resulting in incorrect sentence structure. Thus, "we" is the only option that effectively conveys the intended meaning while adhering to standard grammatical rules.