English grammar error-spotting (object clause after ‘‘know’’; agreement and correlative structure): Read the sentence divided into A–D and select the erroneous part, or ‘‘No error’’ if correct: ‘‘Every motorist knows / road signs—whether symbols or colour codes— have an immediacy / that neither the spoken nor the written word can match. / No error.’

Given data & checks

• A works without the complementizer ‘‘that’’ in English (‘‘knows [that] road signs … have …’’—both are acceptable).
• B has correct plural agreement ‘‘signs … have …’’ and the parenthetical is fine.
• C properly uses ‘‘that’’ as a relative pronoun introducing the clause modifying ‘‘immediacy’’; the correlative ‘‘neither … nor …’’ is grammatical and ‘‘can’’ shows no number variation.

Conclusion
All parts are correct in standard usage; punctuation is to be ignored as per instructions. Therefore choose No error.

Common pitfalls

• Forcing ‘‘that’’ after ‘‘knows’’ when it is optional.
• Mistakenly changing ‘‘can’’ or the relative structure.