How can the situation about helping Ray be phrased using "favour"?

The option that effectively uses "favour" to convey the idea of helping Ray is the one stating that "I did Ray a favour which led to his success." This choice successfully connects the act of doing a favour directly to the outcome, emphasizing that the assistance provided was instrumental in Ray's success. The phrasing clearly indicates a cause-and-effect relationship, making it easy to understand how your action positively impacted Ray.

In contrast, other choices either lack specificity in the causal connection or do not clearly express the act of assistance. For example, stating "I helped Ray and it was a great favour" does not explicitly connect the help to his success, and simply referring to it as a "great favour" can seem vague. The option mentioning “I performed a favour for Ray, resulting in success” suggests a similar idea but feels more detached and less personal than simply stating that you did Ray a favour that led to success. Thus, the best option succinctly conveys both the act of helping and its positive consequence.