The reason why scientists called the invisible matter that makes up a fourth of the Universe "Dark Matter" is because

Question

a
Dark matter is the same color as the black backdrop of space, so it cannot be seen
b
Dark matter radiates light on the dark violet portion of the visible spectrum
c
Dark matter does not interact with radiation or light, thus it cannot be seen
d
Dark matter absorbs all light, thus it makes the local space around it darker

Answer 1

c
Dark matter does not interact with radiation or light, thus it cannot be seen