Step 1: Concept
Oxidation of glucose with a strong oxidizing agent like concentrated nitric acid ($HNO_3$).
Step 2: Meaning
Both the aldehyde group and the primary alcohol group of glucose are oxidized.
Step 3: Analysis
Oxidation of the $-CHO$ at C1 and $-CH_2OH$ at C6 results in a dicarboxylic acid called saccharic acid (glucaric acid).
Step 4: Conclusion
Hence, the correct answer is saccharic acid.
Final Answer: (B)