Identify the segment in the sentence which contains the gram

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THANKU FOR BEING A PART OF OUR JOURNEY TO BRING "REVOLUTION IN EDUCATION"
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Identify the segment in the sentence which contains the grammatical error.

Dwarf galaxies have to hold clues that could help us to understand better the nature of dark matter

[SSC Stenographer 8th Feb 2019 Shift-II]

A could help us

B have to hold

C understand better

D dark matter