This question examines correct word usage and parts of speech within a sentence. 'Attributable' functions as an adjective meaning 'capable of being assigned to,' fitting the context where success is being assigned to the employees' hard work. 'Contributed' and 'contributing' are verbs and do not fit grammatically and 'attribution' is a noun. Therefore, option B is the only choice that makes sense grammatically and semantically. **Core Concept:** Correct word usage and parts of speech. **Solution Analysis:** The sentence requires an adjective to describe the relationship between the company's success and the employees' hard work. 'Attributable' is an adjective, and the other options are either verbs or a noun. **Option Analysis:** - **A. contributed:** This is a verb and doesn't fit the sentence structure. - **B. attributable:** This is the correct adjective to link success to the cause. - **C. contributing:** This is a verb form and doesn't fit. - **D. attribution:** This is a noun and doesn't fit the sentence context. **Common Mistake:** Selecting verb forms 'contributed' or 'contributing' based on a superficial link to the idea of contributing, without considering grammar.