Correct Answer: Enlighten

Solution : The correct choice is the fourth option.

Explanation:

Enlighten means to give someone greater knowledge or understanding about a subject. In a way, it can be seen as the opposite of complicate because when you enlighten someone, you're making things clearer and easier to understand.

The meanings of the other options are as follows:

• Multiply means to increase in number or quantity.
• Dominate means to have control or authority over others.
• Healthy refers to being in good physical or mental condition.