Spelling – Identify the single misspelled word among options A–D (choose exactly one; ignore “All correct”). A) Filled B) Fulfiled C) Expelled D) Skilled

Introduction / Context:
Words that insert an extra “l” before “-ed/-ing” often follow rules tied to stress and syllable structure. The past form “fulfilled” derives from “fulfill” and doubles the “l” before “-ed”: fulfill → fulfilled. Writing “fulfiled” omits one “l” and breaks the standard pattern.

Given Data / Assumptions:

• Filled – correct (fill → filled).
• Fulfiled – intended “fulfilled”.
• Expelled – correct (expel → expelled).
• Skilled – correct (skill → skilled).

Concept / Approach:
Doubling rules: with “fulfill”, American English uses “fulfill/fulfilled”; British English often “fulfil/fulfilled”. In both standards, the past form has double “l” before “-ed”. Therefore “fulfiled” (single “l” before “ed”) is nonstandard in either variety.

Step-by-Step Solution:
1) Identify the base: fulfill (AmE) / fulfil (BrE).2) Form past: fulfilled (double “l” kept).3) Compare option B: missing one “l” → error.4) Confirm other options follow consistent doubling rules: filled, expelled, skilled are correct.

Verification / Alternative check:
Check noun “fulfillment/fulfilment” – both retain double “l” around the suffix; this supports “fulfilled”.

Why Other Options Are Wrong:

• Filled: correct; “filed” would be a different verb.
• Expelled: correct; “expelled” doubles “l” by rule after a stressed syllable.
• Skilled: correct adjective from “skill”.

Common Pitfalls:
Dropping one “l” due to quick typing; mixing BrE/AmE base forms but still the past remains “fulfilled”.

Final Answer:
Fulfiled