Reducing the AMT

Which of the following tax planning ideas would help Beth the most if she currently has to pay AMT taxes?

1. Pay her $1,000 January mortgage payment before the end of the year.
2. Pay her $2,000 January alimony payment to her ex-husband before the end of the year.
3. Recognize a $3,000 short term capital gain on her NYC Corp. stock before the end of the year.
4. Recognize a $4,000 short term capital loss on her XYZ Corp. stock before the end of the year.