What is analogous estimating?

Analogous Estimating is a comparison of a project estimate with similar project costs executed or estimated earlier. Derives from "Analogy". Help to develop an initial estimate based on similarity of parameters. 

Thanks for the invitation , my choice is option B - drop ( Top ) - down estimating technique .

My choice is 'B".

As the name suggests, Analogous estimates is an estimates based on analogy i.e. based on similar works executes in past. It is not very accurate in comparison to parametric estimation as it does not account for inter relationship between different attributes of an activity. 

The most appropriate  option is  B:”drop-down” estimating technique.

Thank you. I think D is appropriate answer.

B.”drop-down” estimating technique.

D. technique used when you have no subject matter experts available.

it is to compare past or previous project to similar current projects

C. more costly and more accuratelyestimating technique.