Correct option is D
The flash point of a lubricant is the temperature at which its vapors momentarily ignite when exposed to a source of ignition. Generally, a
higher flash point is desirable because it indicates better resistance to ignition under operating conditions.
Typical lubricants (such as engine oils) often have flash points in the range of about 300°F to 400°F (approximately 150°C to 200°C), ensuring they can safely handle the temperatures they encounter in normal machinery or engine operation without igniting.
