What part of speech is the word my in "my best friends"

need answer asap

When the subject of a sentence performs the action in the sentence the verb in the sentence is in the what ?

The colonists had difficulty coming together to revolt because they

Examine the public service ad. how does this ad transmit a cultural value? by sharing relevant high school graduation statistics by promoting a new type of educational program by reminding the public of the need for new schools by encouraging people to strive for more education