I want to request an Short Term Payment Plan (120 Days) - not the monthly payments -, but I can't find the this option. Which option should I choose?

[camilahm]

Which option should I check in the step "How would you like to pay your federal taxes?"

[Opus 17]

There really is no “short” payment plan.  The short plan just means pay as soon as you can.  The penalties and interest over 4 months will almost always be less than the application fees for a longer formal plan.  Indicate in TurboTax that you will “pay by mail”.  Then mail a check for as much as you can by April 15, or make an electronic payment at www.irs.gov/payments.  Then pay the balance as soon as you can.  The IRS will bill you for the penalties and interest.