4. Priyanshi Is Writing Some Statements But She is Confused To Know Whether The Statements Are Correct Or Not? Which answer do you think is correct?
[A] We cannot see anything through an opaque object.
[B] Those materials which do not allow any light to pass through them are called opaque
materials.
[C] If we cannot see through an object at all, it is not allowing any light to pass through it and

i think the answre is C but the option is not complete !

we cannot see anything through an opaque object

answer: the exterior temperature of commercial jet planes as they leave the stratosphere and return to the ground increases steadily.

explanation:

the lower most layer of atmosphere is troposphere which extends from 0 to 12 km above the surface of the earth. the temperature initially decreases as distance is increased from the earth's surface. commercial jets fly in lower part of the stratosphere. the stratosphere extends upto 50 km. the temperature in stratosphere starts rising again due to presence of ozone which traps the uv rays.

thus, when the planes leave the stratosphere and return to the ground, the exterior temperature increases steadily.