34. If one gauche interaction is 0.9 kcal/mol, what is the energy difference between cis-decalin and trans-decalin? 
(A) 0.9 kcal/mol
(B) 1.8 kcal/mol
(C) 2.7 kcal/mol
(D) 3.6 kcal/mol
(E) 4.5 kcal/mol