Step 1: The task. We must match each transgenic plant or tool in List A with its purpose in List B. We will reason from what each item is known for.
Step 2: Male sterile Brassica (A). Male sterile plants cannot make their own pollen, so they are used to make hybrid seeds easily without hand emasculation. So A goes with hybrid seed production, which is III.
Step 3: Roundup Ready soybean (B). This soybean is engineered to survive the weedkiller glyphosate, so it is for herbicide tolerance. So B goes with herbicide tolerance, which is I.
Step 4: Flavr Savr tomato (C). This tomato was made to soften slowly, so it stays firm and resists bruising and spoilage. So C goes with bruise resistance, which is IV.
Step 5: Ti plasmid of Agrobacterium (D). The Ti plasmid is the natural gene carrier used as a vector to put genes into plants. So D goes with acting as a vector, which is II.
Step 6: Conclusion. Putting it together, A-III, B-I, C-IV, D-II. Therefore the correct answer is "A-III, B-I, C-IV, D-II". \[ \boxed{\text{A-III, B-I, C-IV, D-II}} \]
