Aplaywright more interested in the psychological than the social was

Based on the cause-and-effect relationship in this sentence, what is the meaning of the word revert? the brownies kali made using a new recipe were too dry, so she reverted to her original recipe. a) to alter or change completely; revise b) to dispose of or remove; to throw away c) to prepare for something; assemble or make d) to go back to a previous state or practice

Can someone me answer this english question

How many syllables does a tanka have? a. 31 b. 17 c. 14 d. 10