Concept:The error is a vocabulary mistake: "trucked" is used instead of "tucked".Explanation:The verb "trucked" means to transport by truck, which does not fit the context.The correct word is "tucked", meaning to place something neatly or snugly.Part (a) should read "Tucked neatly under the pile of clothes".The other underlined parts, (b) and (c), are grammatically correct.Therefore, the error is in part (a).Answer:A (a)