Write the next sentence in the following story.

How to insulate a drop ceiling
Ensure that your ceiling tiles can support the weight of the insulation.
Although batt insulation is fairly lightweight, it can put an undue amount of stress on flimsy drop ceiling tiles and break them.
If you have fiberglass tiles, you'll need to replace them before proceeding.

OPTIONS: (a). You'll need to measure how long each tile will go. For example, a drop ceiling tile will weigh between 20-30 pounds (4.7-6.8 kilograms).; (b). To update the tiles, look for an epoxy sheet covering at your local hardware store. Straighten your tiles so that they're lying evenly on each side.; (c). Some fiberglass tiles will come with built-in decals that make peeling them easier. Other fiberglass tiles will need to be replaced using adhesive putty and a caulk gun.; (d). Fiberglass ceiling tiles cannot support the weight of insulation. If you have the more common wood-and-gypsum ceiling tiles, they will need to be at least 5/8 inch (15 mm) thick to be used safely with batt insulation.;. The answer should be
(d).