<span>The architect had built two skyscrapers before he built the museum.
Past perfect tense always has the word "had" before the actual past tense word. If the answer was just built than you would be looking for just past tense and not perfect past tense.</span>
The first thing the taxpayers can do if they want more information is to visit the website www.irs.gov. This was clearly stated on the form. Therefore, the correct option is C.
