Correct Answer: Extreme

Solution : The correct choice is the fourth option.

Moderate means to keep within reasonable or moderate limits, avoiding excess or extremes. Extreme refers to the furthest or highest degree, exceeding what is usual or reasonable. It is the opposite of moderation.

The meanings of the other words are as follows:

• Medium: It denotes an intermediate level, falling between extremes.
• Temperate: It is characterised by moderation and avoiding excess.
• Easy: It denotes not being difficult or requiring little effort.

Therefore, the correct answer is extreme.