Task: Question Answering
Input (English): Question: What is the characteristic of the quasi-experimental research strategy that differentiates it from the experimental strategy ?: 
 Options:  <1> Single or very small cases are studied. <2> The study is carried out in simulated contexts. <3> There is no random assignment of participants to the different study conditions. <4> Several dependent variables are used. <5> It is done with samples of participants obtained by probabilistic sampling.
Output (English): 3