Topic: Word Meaning, Subject: English Grammar (ইংরেজি গ্রামার)

Best Answer Explained in Below-:

The idiom "ABC" is commonly used to refer to the fundamental principles or basic concepts of a subject. In this context, it symbolizes the foundational elements that one must grasp before moving on to more complex or advanced topics. When we say someone has “ABC” knowledge, we imply that they possess only the essential skills or understanding, similar to knowing the alphabet.

Option D, "Elementary knowledge," accurately captures this meaning as it denotes a level of understanding that is basic or introductory. This contrasts with the other options: "Advanced knowledge" and "Intermediate knowledge," which suggest a deeper or more comprehensive grasp of a topic. Pre-intermediate knowledge, while still foundational, implies a level of competence beyond mere basics. Thus, "Elementary knowledge" is the best choice because it perfectly aligns with the idiomatic representation of "ABC" as the starting point in a learning journey, emphasizing simplicity and the very basics of any subject matter.