The correct option is D A travelling vendor.
The last two sentences of the passage support option C as the correct answer. The last two sentences clearly let the reader know that Rosita is a vendor of knick-knacks and handcrafted pots and pans and one who hopes to earn a lot at the carnival due to the presence of the tourists. She is travelling from her village, Onista, to the capital city of Maru to sell her merchandise. This makes her a travelling vendor.