The correct answer is A. address = “K”.
Option B, address = “K*”, would return all addresses that contain the letter “K”, regardless of where it appears in the address. For example, it would return “123 Main Street” and “12345 K Street”.
Option C, address = “K?”, would return all addresses that contain the letter “K” or the question mark (?). For example, it would return “123 Main Street” and “12345 K Street”, as well as “123 Main Street?” and “12345 K Street?”.
Option D, address = “K#”, would return all addresses that contain the letter “K” or the number sign (#). For example, it would return “123 Main Street” and “12345 K Street”, as well as “123 Main Street#” and “12345 K Street#”.
Therefore, the only option that would return only those addresses beginning with the letter “K” is A.