What substances in plants and eggs are tightly bound to iron and limit its absorption into the body?

The substances in plants and eggs that makes it tightly bound to iron and to be able to limits its own absorption in the body is oxalic acid or phytates. An oxalic acid has the physical appearance of a colorless crystalline solid and it is considered to be an organic compound while the phytates has the ability to bind in dietary materials.

The correct answer would be b