Write the next sentence in the following story.

How to roast chestnuts in an oven
Pre-heat your oven to 350 f (177 c).
Choose your chestnuts.
Start with firm, shiny chestnuts.

Available options:
[a]. Don't worry about putting the core inside because the chestnuts will become smoked in the oven. Spoon the chestnuts into the oven..
[b]. Firm nuts are a viable option, but you can use even firmer, more pliable versions. Chestnuts can also be mixed into muffins..
[c]. Discard chestnuts with cracks or holes in the shell. It's not too uncommon to see white " worms " (larvae) inside some of the chestnuts..
[d]. Choose canning tubs with a running square. To roast chestnuts, season with salt... The answer should be
[c].