A. for
B. with
C. of
D. on
🧠 Explanation:
In the sentence "There are series _ questions," the preposition "of" correctly completes the phrase, indicating a collection or group of questions. Prepositions clarify relationships between words, and "of" specifies the series’ content. This grammatical choice ensures clarity, making the sentence meaningful in contexts like exams or discussions. Proper preposition use is essential in English, enhancing sentence coherence. This example highlights the importance of selecting the right preposition to convey precise meaning, a skill critical in writing, speaking, and understanding structured communication in various settings.
