Final answer:
The statement is false; while field lines must be unique at any point, the field's value can be zero when there is no charge or the field from multiple charges cancels out.
Step-by-step explanation:
The statement that a top property can never have a value of zero is false. This seems to relate to properties such as electric fields where field lines represent the direction of the field. If field lines are crossed, that would imply the field has two different directions at the same point, which violates the property of field lines being unique at any point. However, the value of the field (not to be confused with its direction) can certainly be zero. This could occur at a point where there is no charge or the field from multiple charges cancels out.