Which of the following sectors is a major part of Saudi Arabia's economy?

The oil sector is a major part of Saudi Arabia's economy due to the country's vast reserves and significant production capabilities. Saudi Arabia is one of the world's leading oil producers and exporters, which plays a crucial role in its economic structure. The revenue generated from oil exports substantially supports the national budget and contributes to the development of infrastructure, healthcare, education, and other sectors within the country. This reliance on oil has shaped the economic landscape of Saudi Arabia, making it a fundamental component of its economy.

In contrast, while agriculture, tourism, and technology are also present in the economy, they do not have the same level of impact or contribution as the oil sector. Agriculture has traditionally been less significant due to the country's arid climate, tourism is a growing area but still relatively nascent compared to oil revenues, and although technology is becoming increasingly important, it currently does not overshadow the dominance of oil in economic terms.