Task: Question Answering
Input (English): Question: A particle charged in solution moves when it is placed in an electric field. The speed acquired by the solute under the influence of the applied voltage is the product of the apparent mobility of the solute and the applied field. With regard to this mobility, it can be stated that: 
 Options:  <1> A neutral particle of small size will have a smaller mobility than a neutral one of large size. <2> A macromolecular polymer will have greater mobility than the corresponding monomer. <3> A large particle with a small charge will have great mobility. <4> A small particle of great load will have great mobility. <5> A charged micelle will have less mobility than another micelle of the same size but neutral.
Output (English): 4