Name the following: A metal which does not react with cold water but reacts with steam.

The correct option is D All of these
Magnesium has almost no reaction with cold water. It reacts very slowly with hot water. It reacts with steam when being heated and gives hydrogen gas and metal oxide.
Magnesium + Water $\to$ Magnesium hydroxide + Hydrogen gas
Zinc and iron do not react with cold or hot water. They react with steam slowly to give the respective oxides:
Zinc + Steam $\to$ Zinc oxide + Hydrogen gas
Iron + Steam $\to$ Iron(II) iron(III) oxide + Hydrogen gas