Step 1: Understanding the Concept
Improved crop varieties are bred for resistance to particular diseases.
Step 2: Match the first two
Wheat Himgiri resists leaf and stripe rust (A - IV). Brassica Pusa Swarnim resists white rust (B - I).
Step 3: Match the rest
Cauliflower Pusa Shubhra resists black rot and curl blight black rot (C - II). Chilli Pusa Sadabahar resists tobacco mosaic virus (D - III).
Step 4: Conclusion
The correct combination is A - IV, B - I, C - II, D - III.
Final Answer:
The correct matching is A - IV, B - I, C - II, D - III.
\[ \boxed{\text{(B) }\text{A - IV, B - I, C - II, D - III}} \]