The correct answer is: $68.04\text{ kg}$
Explanation
Conversion factor: $1\text{ lb} = 0.45359237\text{ kg}$ (international avoirdupois pound).
Steps:
- Multiply the mass in pounds by the conversion factor:
$$150\times0.45359237=68.0388555\text{ kg}$$
- Round to a reasonable number of decimal places (commonly two):
$68.0388555\approx68.04\text{ kg}$
Therefore, 150 lb ≈ $68.04\text{ kg}$.