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Algebra Difficulty 2.0 Junior Find the answer United Kingdom

What is the value of the expression $(1-2)-(3-4)-(5-6)-\ldots-(2025-2026)$ ?

(A) $-1013$ (B) $-1011$ (C) $1011$ (D) $1013$ (E) $2024$

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Source: UK Mathematics Trust, licensed © UK Mathematics Trust; past papers published free at ukmt.org.uk. Statement reproduced verbatim; metadata (topic, difficulty) added by this project. Solutions are the publisher's, linked not copied.