Answer
(i) This graph have an Euler path, A->C->B->D->A->E->B->F->A
(ii) This graph does not have an Euler path.
(iii) This graph have an Euler path, D->A->E->B->D->C->A->F->B->C
Work Step by Step
In first graph all nodes have even degree hence it does have an Euler path, In second graph there are 4 nodes with odd degree hence it does not have an Euler path, In third graph there are 2 nodes with odd degree hence it has an Euler path.
(i) This graph has an Euler path, A->C->B->D->A->E->B->F->A
(ii) This graph does not have an Euler path.
(iii) This graph has an Euler path, D->A->E->B->D->C->A->F->B->C
