ANS:A - 2atm & 500°C

The pressure and temperature conditions maintained in catalytic cracking processes typically range around 2 atm to 4 atm of pressure and 500°C to 550°C of temperature. These conditions promote the breaking down of larger hydrocarbon molecules into smaller, more valuable products such as gasoline and light hydrocarbons. Given the options provided:

• None of the options exactly match the typical conditions. However, the closest would be 2 atm & 500°C, although catalytic cracking conditions can vary depending on the specific process and goals of the refinery.