Answer:
Pretty sure its answer a. carbon and sulfur
Step-by-step explanation:
A covalent bond is a bond that is non-metal and non-metal. (sharing is caring) and an ionic bond is a metal and non-metal (metals are mean) lol.
So since we are doing a covalent bond, this means it is a non-metal and non-metal which would be carbon and sulfur because the two are both non-metals.
Hope this helps! (I'm pretty sure i'm right but otherwise please tell me :D)
oh and btw i took the quiz and i got 100% :p