In each of the following questions, two columns are given containing three sentence fragments each. In the first column, the fragments are labelled A, B, and
C. In the second column, the fragments are labelled D, E, and F. You are required to match the fragments from Column I with the fragments from Column II to form grammatically correct and contextually meaningful sentences. Choose the option that provides the correct combination(s).

• B-E: Sets up a flawless conditional relationship: "Unless" the infrastructure is fixed, the organization "will remain" vulnerable. • Why A-F fails: Subject-verb agreement error. The true subject of fragment A is the singular noun "proliferation," which requires the singular verb "has prompted," not the plural "have prompted." • Why C-D fails: Tense mismatch. Fragment C is in the past tense ("remained undetected"), but fragment D uses the present tense "allow" instead of "allowed," making the sentence grammatically incorrect.