Option B: Green and blue
     Let's analyze the given information step by step:
     ● Shirt Colors: Black, Blue, Orange  
     ● Pants Colors: Green, Yellow, Orange  
     Constraints:
         ○ No person wore a shirt and pants of the same color.
         ○ A did not wear a black shirt.
         ○ B did not wear a blue shirt.
         ○ C did not wear an orange shirt.
         ○ A did not wear green pants.
         ○ B wore orange pants.
     Step-by-step deduction:
         ○ Since B wore orange pants, B cannot wear an orange shirt. Therefore, B's shirt must be black or blue.
         ○ A cannot wear a black shirt, so A's shirt must be blue or orange.
         ○ C cannot wear an orange shirt, so C's shirt must be black or blue.
     Analyzing B's shirt:
         ○ B cannot wear a blue shirt (as per constraint 3), so B must wear a black shirt.
     Analyzing A's shirt:
         ○ Since B wears a black shirt, A cannot wear a black shirt. A also cannot wear a blue shirt (as B wears black), so A must wear an orange shirt.
     Analyzing C's shirt:
         ○ C cannot wear an orange shirt, and since A wears an orange shirt and B wears a black shirt, C must wear a blue shirt.
     Analyzing pants:
         ○ A cannot wear green pants, and since B wears orange pants, A must wear yellow pants.
         ○ C, therefore, must wear green pants (as the only remaining option).
     Conclusion:
         ○ C wears a blue shirt and green pants.
     Therefore, the correct answer is Option B: Green and blue.