I'd start with studying the basics by yourself or with the help of a native german speaker, then visit a language course, but if you want to study it to perfection you'll need experience and years of learning..
I'm from Germany and german is my native language, if you need any help feel free to message me!
<h2>The best choice would be</h2><h2>C) <u><em>Hast</em></u></h2><h2>I am 1000% certain because I <em>myself</em> am German and English is actually my second language.</h2>
