Examine the list and answer the following question: which items in the list are primary sources a historian could use to contextualize why a political revolution occurred in egypt in 2011?

2018 means 2018 ce or common era

there have been other eras too including bce, which included way more years.

the outcome of 1970 oil crisis in united states was that, they began to search ways on how to reduce oil.

in 1970 was a period when there were energy and oil crisis. those who were major centers for industrialization were forced to keep way from supplying of petroleum.

some of the result of this crisis was economic growth became stagnant because prices of oil surged.

due to the increased prices some countries like mexico and norway benefited.

the answer is a. harriet tubman was a nurse on the battlefield.