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"Riding a stationery bicycle is sufficient exercise, although it is not as effective as outside biking."
Which of the following corrects an error in the sentence above?

A Replace stationery with stationary

"Replace stationery with stationary" is the correct answer. This is correct because stationery refers to writing products, and stationary means “without movement”.
"Replace biking with bikeing." This is incorrect because the final -e rule suggests dropping the final “e” when adding a suffix that begins with a vowel.
"Replace effective with affective." This is incorrect because effective has to do with results, while affective has to do with emotions/feelings.
"Replace sufficient with sufficeint." This is incorrect because sufficient is an exception to the i-e rule.