Which is true about positive self-talk?
it is most effective if spoken out loud.
it is encouraging rather than discouraging.
it can be discouraging if not successful.
it is less successful than other methods.
o

It is most encouraging rathe than discouraging.

Explanation: it encourages the speaker in many ways. Firstly it would be better to do it in front of a mirror, so you see the impact you are making on your own self. Secondly, it boost you ego knowing fully well you are in control of yourself and your environment. Thirdly, once you do it you can be able to fish out your errors and improve on them.

op: object of preposition

a. "to practice" is the best phrase to complete the sentence.

explanation:

during the summer, she likes to practice her soccer skills so that she is ready to play in the fall.

(note that : all the other options "the practicing of", "practice for" and "to do a practice on" are inappropriate as they make the sentence grammatically incorrect.)