Task: Question Answering
Input (English): Question: The groups with resonant electroacoustic effect are: 
 Options:  <1> Deactivators and ortho / para-leaders. <2> Activators and ortho / para-leaders. <3> Deactivators and meta-leaders. <4> Activators and meta-leaders. <5> Deactivators and do not orient to any position.
Output (English): 2