Write the next sentence in the following story.

How to blacken fish
Heat a dry cast iron pan over medium-high heat.
A cast iron pan is a required tool for blackening fish, as other pans aren't capable of delivering the intense heat needed for this preparation. Set the pan onto a charcoal grill or a propane burner set to medium-high heat.

Available options: (a). Gently pop the bottom of a cast iron pan so it separates from the rest of the pan. You should now be able to separate the shell from the bone. (b). Allow the pan to heat for about 10 or 15 minutes, and do not add any oil to the pan. Melt some butter in a shallow pan. (c). Always do a close inspection of the cast iron pan before placing it on the grill. If it seems unsafe, set a wax pad directly over the pan to keep it cool. (d). Allow the pan to heat until it becomes hot, then remove it from the burner. Stuff and sear the fish pieces on a 40 degree surface.. The answer should be
(b).