Washington Mutual Preferred fka WAMPQ

[eighty]

I bought 100 P at 40 on 10/10/2011
I bought 100 P at 25 on 11/11/2011
I sell 100 P at 30 on 12/12/2011

For tax purpose, how does it affect? Or it does not affect? Any suggestion? There are few options for tax that I see in scottrade.

1. First in First Out
2. Last in First Out
3. Highest in First out
4. Minimum Tax
5. Maximum Gain
6. Average Cost

What is the better option once should choose, if someone buys and sells not more than 15/20 times in a year and only involvement is with long term stock. Thanks.