The rub’ al-khali desert in saudi arabia is almost as big as a. alaska b. mesopotamia c. texas d. south asia

The answer is ç. Texas

The Rub' al Khali desert is the largest contiguous sand desert  in the world,encompassing most of the southern third of the Arabian Peninsula. The desert covers some 650,000 km2. I am not sure about the numbers.

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C.Texas

The Rub’ al-Khali desert in Saudi Arabia has an extension of 650,000 km2, similar to the one fo Texas, which is 696,241 km². The other three options are either too big (Alaska, South Asia) or too small (Mesopotamia). The Rub’ al-Khali desert in Saudi Arabia is the largest continuous sand desert in the world.