Read the following context and choose the best option to answer the question.
Context: It was the Reebok 10 K marathon . I was 6 hours standing up , going from one place to the other , collecting tea / coffee cups , napkins , glasses , garbage , serving drinks . My feet are alright , though they hurt . My face ... oh god MY FACE !
Question: What may be the reason why their face hurts ?
Options: 
- They have a sunburn .
 - None of the above choices .
 - They were smiling so much .
 - They had an allergic reaction .


They have a sunburn .