English grammar — Spot the error (choose the segment that contains a grammatical error; choose ‘‘No error.’’ if the sentence is correct). Sentence: The historian has been working on the project from last 12 years.

Introduction / Context:This question tests correct preposition and time expression with perfect/progressive tenses. English requires particular prepositions with time spans depending on whether we refer to a starting point or a duration.

Given Data / Assumptions:

• Tense used is present perfect progressive: “has been working”.
• Time span mentioned is “last 12 years,” a duration (length of time), not a starting point.
• The intended meaning is “for the last 12 years.”

Concept / Approach:Use “for” + duration (for two hours, for three weeks). Use “since” + starting point (since 2012, since last June). “From” is not used with present perfect to mark duration; it would require a paired “to” (from X to Y) or a different construction.

Step-by-Step Solution:

Verification / Alternative check:Correct sentence: “The historian has been working on the project for the last 12 years.” A valid alternative with a starting point would be “since 2012/2013,” etc.

Why Other Options Are Wrong:

• A: Noun phrase is fine.
• B: Present perfect progressive is appropriate.
• C: Prepositional phrase “on the project” is correct collocation.

Common Pitfalls:Confusing “from” with “for.” “From” typically pairs with “to/till/until,” not with an open-ended duration in perfect tenses.

Final Answer:from last 12 years.