Help answering statement

¡hable más lentamente, por favor! a. his friend b. his parents c. his teacher d. his classmates

"in english, write six to eight sentences comparing cultural aspects of greetings in spanish-speaking countries with greetings in your own culture. use what you learned in the lessons to tell about three differences and three similarities. discuss non-verbal greetings and how respect is shown. you may also include verbal greetings, but do not simply translate phrases from one language to another."

Which of the following is the first-person singular (yo) form of the verb "to think" in present tense? a. pienso b. penso c. piensa d. pensamos