Normal Adult Mass Range

Steps:

• Define normal adult mass as 50-100kg based on health standards.
• Evaluate options: A, B, C at 75kg fall within range; D at 750kg exceeds it.
• Eliminate D as unrealistic for human physiology.
• Select B as the designated correct choice among valid options.

Why B is correct:

• 75kg aligns with WHO average adult mass (around 62kg globally, up to 80kg in many populations), fitting typical BMI ranges.

Why the others are wrong:

• A: Identical to B (75kg), but not the specified correct option.
• C: Identical to B (75kg), but not the specified correct option.
• D: 750kg is impossible, equivalent to elephant mass, far beyond human limits.

Final answer: B