#2 is a good choice. #3 will probably be ok, voltage drop may or may not be an issue depending on the actual load.
2-2-2-4 means three #2's and one #4.
Since your going through an attic you may need to derate the ampacity based on ambient temperature. The 90 deg. ampacity for #3 copper is 110 amps, for ambient temp. over 105 deg. F derate by .87, if over 114 deg. F derate ampacity by .82 which will come to 90.2 amps. #3 may still be code compliant since the breaker size can be rounded to the next available breaker size.