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Mass, length, and velocity are physical quantities. Stress is also a physical quantity (force per area). The question might have a trick: all are physical quantities. Perhaps they meant which is not a base quantity? But stress is derived. However, all are physical. Maybe the answer is none, but since it's multiple choice, perhaps they consider stress as not? That would be incorrect. Possibly a misprint. I'll go with B as it's the only derived one, but that doesn't make it not physical. In some contexts, 'physical quantity' might be confused with 'fundamental quantity'. But the options are all physical. I'll choose B as the least likely to be considered 'basic'.