Answer:
Option a. The following is the correct way of writing the sentence:
Joey isn't moving to Denver after all.
Step-by-step explanation:
The present continuous or progressive is a verb tense that indicates that an action or condition is occurring now, frequently and that may be even continue in the future. The proper way of writing the sentence is using the present continuous as it implies that after all, Joey is still moving to a different city, in this case Denver. The present continuous formula is to use the verb to be + the verb in the present participle.