Error spotting (exam direction): Identify the erroneous part (A/B/C) in the sentence — choose D if there is no error — 'Regretfully, profits earned by your company / fell by 20 per cent last year / despite higher sales. / No error.'

Given parts (A–D)
A. Regretfully, profits earned by your companyB. fell by 20 per cent last yearC. despite higher sales.D. No error.

Concept/Approach (word choice: 'regretfully' vs 'regrettably')
Use regrettably to express the speaker's opinion that something is unfortunate. Regretfully describes the subject's manner (i.e., 'with regret'). Here, the writer is commenting; therefore, 'Regrettably' is idiomatic.

Step-by-step correction
1) Replace adverb of comment: 'Regretfully' → 'Regrettably'.2) Corrected opening: 'Regrettably, profits earned by your company…'

Verification/Alternative
Compare: 'She spoke regretfully about the loss' (manner) vs 'Regrettably, profits fell…' (comment on situation).

Common pitfalls
Confusing comment adverbs with manner adverbs.

Final Answer
A — 'Regretfully, profits earned by your company' should start with 'Regrettably'.