How does the word tetra relate to the game tettis

First off do you mean the game tetris? If so here is the

Tetra is a prefix which means “four” and is used when forming compound words. In tetris, we use pieces (called tetrominos), which are formed by combining 4 small blocks (called minos). There are 7 possible types of tetrominos named after the letters that they resemble: I, O, L, J, T, S, and Z.

it would most likely be b. your welcome.

- "when these words are put together to convey a meaning it is known as a sentence. a sentence is a group of words that makes complete sense. placing of words in a sentence is very important. the second sentence is a question."