The second and third questions involve ethnicity and race. To me, these seem to be directly related to racial politics, and thus something I feel is insulting. However, my advice is to be strictly honest. When it asks about ethnicity, it is asking about culture and not genetics. Thus, if you have been influenced by Hispanic culture, part of the origins of you and your personality is Hispanic. Check off the box of the type of Hispanic culture that has influenced you the most.
The third question involving race can also be successfully handled in a similar manner. As near as science can say, humanity has it's origins in Africa. Thus, everyone is an “African American,” and should check that box. Were you born in the United States? That makes you a Native American. Were you born in Asia? You are a native Asian. Also, look at racial origins in your religion. According to Jewish, Christian, and Islamic teachings, all nations of the Earth are decedents of Noah, making everyone of Mid-Eastern ancestry. You can check as many boxes as you like, so I suggest you do.
Finally, there is a checkbox below that says “other” and allows you to write in your race. I would encourage you to check that box and write in “Human.” Ultimately, that is the only race we belong to, and the only one to which we should want to belong.