Outside India, Buddhism was first accepted in

The other options are incorrect because:

• Japan: Buddhism was first accepted in Japan in the 6th century CE, after it was introduced from China.
• Sri Lanka: Buddhism was first accepted in Sri Lanka in the 3rd century BCE, after it was introduced from India by the Indian emperor Ashoka.
• Tibet: Buddhism was first accepted in Tibet in the 7th century CE, after it was introduced from India by the Indian monk Padmasambhava.