Final answer:
The 8-letter word for a long, slender cigar in the provided options is 'Cigarillo', which is smaller than a standard cigar but larger than a cigarette.
Step-by-step explanation:
The 8-letter word for a long, slender cigar among the options provided is d) Cigarillo. A cigarillo is a small, narrow cigar that is shorter than a standard cigar but longer than cigarettes. The other options a) Cigarette is usually shorter and very thin, b) Stogie can sometimes refer to a cheap cigar and is not strictly defined by its size, and c) Cheroot is a type of cigar with both ends cut flat. So, cigarillo is the correct answer that fits the description of an 8-letter word for a long, slender cigar.