Where's the error?

Answer C

As vocabulary.com puts it, "specially" and "especially" have "just a hair's breadth of distance between them." Both adverbs mean "particularly", but in slightly different contexts. "Specially" indicates a particular or specific purpose, while "especially" refers to a particular or exceptional quality. Another subtle distinction between the words is that "especially" implies that something is, well, special — i.e., that something else is lesser. "Specially" does not imply that something else is inferior.

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