Correct Answer: wasteful, increase

Solution : The correct choice is the third option.

Wasteful: Using or expending resources carelessly, extravagantly, or for no purpose. This is the correct option, as it conveys the idea of inefficient energy consumption that the king plans to move the kingdom away from.

Increase: To become or make greater in size, amount, intensity, or degree. This is also the correct option, as it aligns with the king's plan to move away from wasteful domestic energy consumption and increase oil exports.

The meanings of the other words are as follows:

• Extravagant: Lacking restraint in spending money or using resources.

• Unnecessary: Not required; not needed.

• Substantial: Of considerable importance, size, or worth.

• Decrease: To make or become smaller or fewer in size, amount, intensity, or degree.

• Minimise: To reduce to the smallest possible amount or degree.

• Moderate: Average in amount, intensity, quality, or degree.

Therefore, the sentence is: "The king plans to move the kingdom away from wasteful domestic energy consumption, a change that will allow the Saudis to increase oil exports in the years to come."