How many nonempty subsets B of {0,1,2,3,…,12} have the property that the number of elements in B is equal to the least element of B? For example, B={4,6,8,11} satisfies the condition.<spanclass=′latex−bold′>(A)</span>256<spanclass=′latex−bold′>(B)</span>136<spanclass=′latex−bold′>(C)</span>108<spanclass=′latex−bold′>(D)</span>144<spanclass=′latex−bold′>(E)</span>156