Answer:
A poor insulator!
Step-by-step explanation:
Since Iron has molocules so close together it CAN conduct heat very well. Because of this A and C are not relavent options.
Thermodynamics is "the branch of physical science that deals with the relations between heat and other forms of energy (such as mechanical, electrical, or chemical energy), and, by extension, of the relationships between all forms of energy."
Due to the fact iron is a strong conductor, it IS bound to the law od thermodynamics. It's a very easy conceept to understand, you just have to pay attention a little bit and searching up definitions can help too!