Institution: Bangladesh Shilpa Bank Ltd Exam: Bangladesh Shilpa Bank Ltd - Officer - 2004
Topic: Sentence (বাক্য), Subject: English Grammar (ইংরেজি গ্রামার)

Best Answer Explained in Below-:

The correct answer is B) radius because it is the only word among the options that is not presented in its plural form.

To explain further, let's look at each option. "Data" is the plural form of "datum," referring to individual pieces of information. In contemporary usage, "data" is often treated as a singular mass noun in casual contexts, but it is technically plural. "Phenomena" is the plural of "phenomenon," which indicates occurrences or events that can be observed. "Curricula" is another plural noun, derived from "curriculum," meaning different courses of study offered by an educational institution.

In contrast, "radius" refers to a singular line segment extending from the center of a circle to its perimeter, making it a singular noun. Its plural form is "radii," but here "radius" stands alone. Therefore, among the provided options, only "radius" is in its singular form, confirming it as the correct answer to the question about which word is not in the plural form.