Which of the following is
an invalid argument?
A.
If light is composed only of waves, then light cannot travel across
empty space. But light is composed only of
waves, therefore light cannot travel across empty space.
B.
If light is composed only of particles, then light cannot exhibit
diffraction patterns; and light is composed only of particles, so light cannot
exhibit diffraction patterns.
C.
If light is composed only of waves, then light cannot travel across
empty space. But light can travel across
empty space. Therefore light is not
composed only of waves.
D.
If light is composed only of particles, then light cannot exhibit
diffraction patterns; and light is not composed only of particles, therefore
light can exhibit diffraction patterns.
