Which of the control lights visible in the illustration upon lighting up, requires you to stop immediately and rectify the fault?

Why?

The red oil-can warning light B indicates excessively low oil pressure while the engine is running. Continuing to drive could cause the engine to seize, so stop as soon as safely possible and switch off the engine. Do not resume driving until the cause of the warning has been resolved. A indicates an ABS fault and C indicates low fuel, so neither signals this lubrication problem.