Correct answer: (a) Only one
Explanation
- A
Only one
Only one pair. Pulsars are spinning neutron stars from core collapse. Cepheids are not dust clouds; nebulae are not periodic variable stars — those two labels are swapped.
- B
Only two
Only two. Cepheids and nebulae are reversed.
- C
All three
All three. Two of three rows are inverted.
- D
None
None. The pulsar row is correctly matched.
Summary. Official key is (a) only one. Pulsars are rapidly rotating neutron stars left when massive stars collapse. Cepheids are variable stars (period–luminosity). Nebulae are clouds of gas and dust. Pairs 1 and 2 swap those meanings.
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