Answer: C) 112g of Fe contains the largest number of atoms.
Explanation: When you convert the grams of the elements in the question to the number of particles in 1 mole from there you would be able to determine which choice actually contains more number of atoms than the rest.
You first divide the grams given to you by the atomic mass and then multiply that number by Avogadro's number which is 6.022 x 10^23. As shown in the image.