SKpetro call warrant oh SKpetro call warrant

If you believe oil will rebound from July onwards, I think june maybe can buy warrant to ride the rebound of oil price.

Which call warrant is worth to buy or less risk?

A glance of all skpetro warrant:

Active Warrants

NameTypeListing DateMaturity DateExercise PriceWarrant PriceRatioPremiumGearing
SKPETRO-CUCall Warrants15/01/201430/01/20155.000.0055 : 12.355 (88.20%)106.80
SKPETRO-CWCall Warrants24/01/201422/01/20154.500.0058:11.87 (70.03%)66.75
SKPETRO-CXCall Warrants10/06/201430/06/20154.000.015 : 11.38 (51.68%)53.40
SKPETRO-CYCall Warrants08/07/201407/05/20154.500.0055:11.855 (69.47%)106.80
SKPETRO-CZCall Warrants22/07/201420/05/20154.500.0055:11.855 (69.47%)106.80
SKPETRO-C1Call Warrants19/08/201428/08/20154.180.0057:11.545 (57.86%)76.285
SKPETRO-C2Call Warrants20/10/201431/07/20154.200.0055:11.555 (58.23%)106.80
SKPETRO-C3Call Warrants20/10/201405/05/20154.200.0052.4:11.542 (57.75%)222.50
SKPETRO-C4Call Warrants20/10/201401/09/20155.000.0255:12.455 (91.94%)21.36
SKPETRO-C5Call Warrants30/10/201428/10/20153.480.046:11.05 (39.32%)11.125
SKPETRO-C6Call Warrants17/11/201413/11/20153.800.155:11.88 (70.41%)3.56
SKPETRO-C7Call Warrants19/11/201430/11/20153.180.1053:10.825 (30.89%)8.476
SKPETRO-HBPut Warrants19/11/201430/11/20152.680.223:10.00 (0.00%)4.045
SKPETRO-C8Call Warrants02/12/201401/07/20153.200.102.6:10.79 (29.58%)10.269
SKPETRO-C9Call Warrants17/12/201415/12/20152.800.105:10.63 (23.59%)5.34
SKPETROC10Call Warrants22/12/201422/10/20152.500.174:10.51 (19.10%)3.926

http://klse.i3investor.com/servlets/stk/warelated/5218ci.jsp

I will choose SKpetro-C9 because:

a) Longest expiry date
b) 2nd Lowest premium