Which sentence is punctuated correctly?

what class or school are you in i may

the economic activity signified in that scenario is a. production

in general, market production makes reference to the elaboration of a product or service which is destinated for economic purposes (to be sold) at money-price in a market. such product or service has to be principally tradable for money.

there is no money exchange involved in distribution, generalized reciprocity or balanced reciprocity.

in the following paragraph, the fourth sentence the correct answer is: three personal subject pronouns

”she was embarrassed when she found that they had been put back on the shelves…”

a   subject pronoun is a personal pronoun. i, you, he, she it, we, they.  

in the sentence it can be observed she, used twice and they used once. is for this reason that is a three personal subject pronoun sentence.