Fill in the blanks with the most appropriate option that follows:
In many cases in physics, one has to deal simultaneously with collective and single-particle excitations of the system. The collective excitations are usually bosonic in nature while the single-particle excitations are often fermionic. One is therefore led to consider a system which includes bosons and fermions. Hence, _____________ Which of the following options is most likely to follow the paragraph given above?
The blank is preceded by the idea of systems which include both bosons and fermions. Therefore, the following sentence must talk about mixed bosons fermions systems.
Hence, option B is the correct answer.
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