Error spotting (tense + spelling: writing vs wiring; present perfect progressive with 'for'): Identify the erroneous segment (A/B/C) — choose D if correct — 'He is wiring / for the / last four hours / No error.'

Given data
The intended meaning is continuous activity over a duration. Two problems occur in (A): the word should be 'writing', not 'wiring'; and with 'for the last four hours', standard English uses the present perfect progressive ('has/have been + -ing').

Step-by-step correction
(A) 'He is wiring' → 'He has been writing'.Corrected sentence: 'He has been writing for the last four hours.'

Common pitfalls
Using present continuous with 'for/since'; typographical confusion between 'writing' and 'wiring'.

Final Answer
(A) is erroneous → 'He has been writing …'