Answer:
The phrase As a chef, at the beginning of the second paragraph, establishes the author as having expertise on the topic of cooking. The correct answer is the second one.
Step-by-step explanation:
Even if the phrase were at the beginning of the article, and not at the beginning of the second paragraph, it wouldn't mean that the article will use technical language related to cooking, nor that chefs are the intended audience of the article. The author might even start the whole article with that phrase in order to present him/herself and start talking about his/her life, that wouldn't mean the article is going to be about cooking. The phrase doesn’t establishes the author as a big celebrity either, since not every chef is one. That phrase at the beginning of the second paragraph only says about the author that he/she knows a lot about cooking and that he/she has experience in the topic.