Correct Answer: Obvious

Solution : The correct choice is the t hird option: obvious.

Obvious refers to something that is easily seen, recognised, or understood. It describes things that are clear, apparent, or evident without requiring much thought or observation.

Conspicuous refers to something that is easily noticeable, visible, or attracts attention due to being prominent or standing out noticeably from its surroundings.

The meanings of the other options are as follows:

• Opaque refers to something that is not transparent or translucent, meaning that light does not pass through it.
• Unnoticeable describes something that is not easily seen, detected, or observed.
• Effective indicates something that produces the intended or desired result, outcome, or effect.