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Correct answer: B. Go is available in only some countries, and yours may not be included
Explanation
The principle — plan availability is regional, and a missing plan is usually about where you are rather than what you have done.
Why the key is correct — OpenAI notes that ChatGPT Go is available in a limited set of countries currently, with other regions possibly becoming eligible in the future, and that access is being rolled out gradually within eligible countries.
Why the others are wrong — subscriptions are not unlocked by using up a free allowance. Go does not replace the free tier; it is described as everything in Free plus more. And it is an individual plan rather than a business one.
Remember this — before assuming something is broken, check whether the feature has reached your country yet.
Sources — OpenAI's What is ChatGPT Go article.
Sources
“Note: ChatGPT Go is available in a limited set of countries currently. Other countries and regions may be eligible in the future.”
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