If your halloween costume is synthetic, that means it's made of
man-made material, like polyester
natural material, like cotton
expensive material, like silk
scary material, like spider webs

Man made material like polyester

Explanation:

The Halloween costume is synthetic in nature which means that it is not produced by natural ways.

Synthetic is a man made polymer which is used to make clothes. It is available in different colors and patterns which looks very attractive.

This material is processed in the industry and is not very costly as like that of natural materials.

It is easily available everywhere and is used at different occasions to make clothes and other things.

a) carbon, hydrogen

b) carbon, hydrogen, oxygen, nitrogen

c) carbon, hydrogen, oxygen, nitrogen, phosphorus

d) sugar

e) amino acid

f) nucleotide