When a block exists within another block, the blocks are a) structured b) nested c) sheltered d) illegal

(B) Nested

Explanation:

 In the computer programming language, the nested is also known as inner class. It is defined as when a block are nested inside the one another block and it is basically used when we want to create similar number of variables and also block withing the program. A variable stops to exist toward the finish of the square where it is proclaimed.

It is used as nested function in the programming language, as nested function is the enclosing type of function which is define with another function in the same program.  

alcohol flush reaction is a condition in which a person develops flushes or blotches associated with erythema on the face, neck, shoulders, and in some cases, the entire body after consuming alcoholic beverages. this syndrome has been associated with an increased risk of esophageal cancer in those who drink.

explanation:

i don't know to be honest but you on your own

step-by-step explanation:

ignitia made me retarted fool im stoopid laugh like shi

explanation: