Please answer the following question: Read the article and select the best answer. Article: Teachers' Day is, interestingly, not celebrated on the same day all over the world. In some countries it is marked by a holiday, in others it is a working day. International Teachers' Day is celebrated on October 5. Being held ever since 1994, it is in honor of teachers' organizations worldwide. Its aim is to encourage supports for teachers and to meet the needs of students. China--In 1939, Teachers' Day was set for August 27, Confucius' birthday. In1951, the celebration was stopped. However, it was founded again in 1985, and the day was changed to September 10. India--Teachers' Day is celebrated on September 5 in honour of Dr. Sarvepalli Radhakrishnan, the second president of India, whose birthday falls on that day. Russia--In Russia, Teachers' Day was celebrated on the first Sunday of October between 1965 and 1994. Since 1994, the day is _ on October 5, just the same day as World Teachers' Day. The US--In the US, Teachers' Day is non-official holiday. It is celebrated on the Tuesday of the first full week of May. A number of activities are organized in schools to honor teachers. The celebrations can continue for the whole week of May. Thailand--In Thailand, National Teachers' Day is celebrated every year on January 16. The first Teachers' Day was held in 1957. The day is a holiday in schools. Question: Which of the following is possibly true? Options: A: China has celebrated Teachers' Day since the year 1931. B: Teachers' Day is an official holiday in the United States. C: Dr. Sarvepalli Radhakrishnan's birthday is in September. D: Teachers' Day is a working day in schools of Thailand.
A:
C