My sister is good at cooking. My brother is bad at...

Câu hỏi: My sister is good at cooking. My brother is bad at it. 

A My sister is good at cooking, or my brother is bad at it.

B My sister is good at cooking, so my brother is bad at it.

C My sister is good at cooking, for my brother is bad at it.

D My sister is good at cooking, but my brother is bad at it.