In the question, two sentences (I) and (II) are given. Each sentence has a blank in it. Against each five options are suggested. Out of these, only one fits at both the places in the context of each sentence. Mark that option as your answer.
I. The _______ system involves an economic transaction where an actual exchange of goods takes place.
Il. In prison he would often use his paintings as a means of _______ to get food.
The sentences suggest that the blank should contain a word that means 'an exchange of goods for each other', so 'currency' is eliminated. Binder and higher also are irrelevant. Monopoly and barter are both viable options; but since monopoly means sole control, which does not make sense in terms of the second sentence. So, only barter, which means exchanging one thing for another, is the correct choice here.
Therefore, the correct answer is option 2.