Formulate a multiple choice question related to the following topic.
Which of the following was a popular payment system developed in the 19th century?

a) Credit cards
b) Bitcoins
c) Paper checks
d) Mobile payments
The payment systems developed in the 19th century
Below is an instruction that describes a task, paired with an input that provides further context. Write a response that appropriately completes the request.

### Instruction:
Formulate a multiple choice question related to the following topic.

### Input:
The payment systems developed in the 19th century

### Response:
Which of the following was a popular payment system developed in the 19th century?

a) Credit cards
b) Bitcoins
c) Paper checks
d) Mobile payments