Final answer:
Option C: "Resolve the issue immediately." demonstrates the most effective use of action verbs.
Step-by-step explanation:
The sentence that demonstrates the most effective use of action verbs is option C: "Resolve the issue immediately." This sentence uses the action verb "resolve" to convey a sense of urgency and directness. It is concise and to the point, cutting out unnecessary words and phrases.
On the other hand, options A, B, and D use passive voice constructions and the verbs "is," "needs," and "be." These verbs do not convey a strong sense of action and can make the sentences sound more passive and wordy.