Razor blades are examples product.
a. captive
b. optional
c. by-product
d. a or b
e. none of the above.

Captive product

Explanation:Captive products are the products that are manufactured for the purpose of being used with other core product.These product are made for the increment of the revenue by the sellers.Generally it is seen that captive products are high priced than the core product .Thus razor is supposed to be used with shaving cream/foam cream , therefore it is a captive product.

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given the lack of choices, i'm gonna wing it and say that pushing your car off a cliff might not be the best idea. your car might sustain damage from the fall and will probably result in the car being too damaged to jump start.

if that's not good enough, avoid filling the car with bees. bees might get agitated when trapped or during the moving process, and might result in death or painful stings that will make jump starting your car very difficult. but in the event that you do choose to fill your car with bees, remember to wear protective gear!