Correct Answer: Obvious

Solution : The correct choice is the first option .

Obscure is something that is difficult to understand or see.
Obvious is something that is clear and apparent.
Both of these words imply the opposite meaning, making them antonyms.

The meanings of the other options are as follows:

• Complementary refers to something that completes or enhances something else by adding different qualities that improve or balance it.
• Moody is someone whose moods change unexpectedly.
• Difficult is something that needs skills or effort.