Hi Monkeycoffee; Welcome to English Forums. To me, answer B is not wrong at all. However, C is a little better.
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monkeycoffeeMy question is why answer B is wrong?It is not wrong. It is a poorly formed question that CU press should be ashamed of. Both B and C are good answers.
Vorpar*Will is used at the instant that plans are made or changed. Going to is used for plans that are already set.Unfortunately, that is not a rule that native speakers often follow.