“ LIMITING REACTANT” please help!

The answer for #3 is c but i don't know why

2. you__turn left on a red light if you are in the left-most lane of a one-way street, you're turning into the left-most lane of a one-way street, and no nearby sign prohibits the turn.

Which element forms an ionic bond with flourine? 1) fluorine 2) carbon 3) potassium 4) oxygen