answer: m ,
the root of the word is mat, meaning "thinking, animated" from greek, matos
auto is a prefix which means self. ic is a suffix that makes the adjective.
the root if the word is grati from the latin word ,gratus meaning
do a favor to. the suffix fy make the verb form.
the root is ten from from latin tenēre, meaning have.
this word contains a prefix, un, meaning not, and a suffix ,able, used to make the adjective.