Final answer:
The present tense sentence from the given options is "Each campaign uses its war chest to buy up domain names," as it employs the simple present tense verb "uses."
Step-by-step explanation:
The sentence from the passage that is in the present tense is D) "Each campaign uses its war chest to buy up domain names." This sentence uses the simple present tense verb "uses," which indicates an action that is currently ongoing or a habitual action. The other sentences provided are in various other tenses: sentence A) uses past tense, sentence B) uses the future conditional tense, and sentence C) uses past tense as well.