EVERY GRAPH HAS 2 PROPERTIES:
1) SUM OF DEG OF VERTICES IS EVEN
2)SUM OF OF VERTICES IS EQUAL TO TWICE THE NUMBER OF EDGES
1)1+2+3+4+5=15(NOT EVEN(VIOLATING 1ST PROPERTY))
2) 3+4+5+6+7=25(NOT EVEN(VIOLATING 1ST PROPERTY))
3)1+4+5+8+6=24
4)3+4+5+6=18
SO ANS(B)