Final answer:
The expression 사이^에 (sai-e) in Korean means 'between' or 'among.' Both options a and b correctly use the expression 사이^에 to indicate that something is between two things.
Step-by-step explanation:
The correct answer is c. Both a and b. The expression 사이^에 (sai-e) in Korean means 'between' or 'among.' In option a, 'I am between the bank and the park,' the word 'between' indicates the use of 사이^에. Similarly, in option b, 'The pharmacy is between the school and the police station,' the word 'between' also indicates the use of 사이^에. Therefore, both options a and b correctly use the expression 사이^에 to indicate that something is between two things.