42.
Your Answer is
Correct Answer is G
Explanation
According to the meaning of the sentence "today there are more than 400 potters in Mata Ortiz, all of them make utensils by hand..." all of appears before the underlined part, and only which appears after the preposition in the attributive clause (referring to things) or whom (referring to people), so it is wrong to judge who. And here refers to potters (people), so which is wrong and whom is correct. The H option makes two complete sentences before and after, but there is no conjunction connection, so it is wrong.