Final answer:
The correct 4-letter word that means a vantage point or a belief is 'View', as it describes a perspective or attitude toward a matter.
Step-by-step explanation:
The 4-letter word for a vantage point or a belief is 'View'. Option c) View correctly matches the definition of a place or position affording a good perspective, or a particular attitude or way of considering a matter. In contrast, 'Peak' (option a) refers to the highest point, 'Crest' (option b) typically to the top of a hill or wave, and 'Opus' (option d) describes a work of music or set of works with a specified rank in an artist's output.
It is important to not confuse similar-sounding words such as 'peak', 'peek', which means to take a secretive look, and 'pique', which as a verb means to spark interest or as a noun refers to irritation. Without context, one might not realize that the correct answer aligns with the definition for 'View', a term often used to express one's belief or perception from a particular vantage point.