Specifications Describe what the product should do, what it should look like and how it will function.​

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.)

second one- because has facts and not opinion

i think its a waste but, it also important for are education