aabc _ bca _ b _ a _ bc

aabca

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aacba

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aaaca

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abaac

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Solution

The correct option is D aaaca
Given the sequence aabc_bca_b_a_bc
By checking the options, we can clearly see that . only option C has a meaningful sequence.
After substituting Option C . the sequence will be $a a b c / a a b c / a a b c / a a b c$ which is cyclic, with aa,b,c as elements.
Hence the correct option is C(aaaca)

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