What was common between La Marseillaise and the red cap?

Correct answer: Both were revolutionary symbols

The direct answer is that both were revolutionary symbols, so option A is correct. La Marseillaise was a patriotic revolutionary song that became associated with the people and the defence of the nation. The red cap, especially the red liberty cap or Phrygian cap, was a visible symbol of freedom and revolutionary identity. Although one was heard and the other was worn or displayed, both helped people express support for the Revolution. Option A is correct because it identifies their common political and cultural role. Option B is wrong because neither was an order issued by the king; both were linked to revolutionary movements. Option C is wrong because feudal dues were payments or obligations connected with the old feudal system, not songs or caps. Option D is wrong because Church taxes were financial obligations, not revolutionary symbols. The question asks what they had in common, not whether they were exactly the same kind of object. One was a song and one was a visual sign, but both created a shared revolutionary identity. Remember: songs and symbols can spread political ideas and unite people.