If you could make one thing (an item or a service) in the world free of charge to everyone, what would you choose and why? How would this change the world? My essay is about making education free but I´ve said everything I need to and can´t reach the word limit

Select the sentence that has no punctuation or capitalization errors. a.this semester, i'm taking math, history, german, and english. b.this semester, i'm taking math, history german and, english. c.this semester, i'm taking math history, german and english. d.this semester, i'm taking math, history, german, and english.