Match the following marker genes in Group I with suitable selecting agent in Group II.
| Group I | Group II |
| P. nptII | 1. Glyphosate |
| Q. aroA | 2. Phosphinothricin |
| R. hpt | 3. Kanamycin |
| S. bar | 4. Hygromycin B |
A. P-1, Q-2, R-4, S-3
B. P-3, Q-2, R-4, S-1
C. P-2, Q-3, R-4, S-1
D. P-3, Q-1, R-4, S-2
Answer: Option D

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