In terms of visibility, 'obscure' most nearly means:

• A. Not famous or well-known
• B. Difficult to see
• C. Faint; vague
• D. Unnoticeable

Answer: (B)

The idea being tested is how the word obscure describes visibility. Obscure in this sense means not easily seen or perceived. So the best fit is the option that means it’s hard to see. While obscure can also mean not well known in other contexts, for visibility it points to something that isn’t readily visible, not something that’s faint or unclear in meaning, and not something that cannot be noticed at all. Among the choices, “Difficult to see” matches that sense most directly. The other options refer to fame, being faint or vague, or being utterly unnoticeable, which don’t align as closely with the common sense of obscuring visibility.