Two examples of non-luminous objects are:

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Stars, the moon

A burning candle, a glowing bulb

The moon, a spoon

Stars, a spoon

answer is C.

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Detailed Solution

Concept: Recall the definitions and characteristics of luminous and non-luminous things. Next, classify each of the given objects as luminous or non-luminous. The proper choice is the one where both non-luminous items are located.
We must first grasp what luminous and non-luminous mean in order to comprehend what instances of non-luminous items there are.
Luminous objects are those that both possess and emit light on their own. These are often the visible things, therefore their visibility in the dark depends on them. Our eyes sense different things by detecting the light that bounces off of them. Sun, stars, torches, and candles are a few examples of these items.
Non-luminous objects are those that do not possess a source of light energy on their own; as a result, they are unable to emit light and do not contribute to vision. Only light things can make these items visible. The moon, trees, and spoons are a few examples of non-luminous items. These two groups are considered visible items.
Now that we know what luminous and non-luminous items are, we can distinguish between them with ease. Moon and spoon are two instances of non-luminous things as a result. Since the moon merely reflects sunlight and does not produce any light of its own, we cannot view the moon without the aid of another source of light.
A spoon, which is a man-made item, is non-luminous since it lacks a natural light source like the sun or even an artificial one like a torch's battery. Therefore, a spoon is a non-luminous object as well.
Therefore, examples of non-luminous things are the moon and a spoon.
Hence, the correct option is 3.

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