11. Which one of the following is a correct formation reaction?

A. C (diamond) → C (graphite)

B. H2 (g) + O (g) → H2O (l)

C. C (graphite) + 4H (g) → CH4 (g)

D. 6C (graphite) + 6H2O (s) → C6H12O6 (s)

E. 2C (graphite) + 3H2 (g) + ½O2 (g) → C2H5OH (l)

From the choices presented above, I can say the correct answer is option D. The reaction that falls under the formation reaction type is 6C (graphite) + 6H2O (s) → C6H12O6 (s). This is because the reactants combine and form only one single large product.