To persuade the reader to agree with the writers position/opinion is the purpose of what text type? A. Narrative
b. Argumentative
c. Discussion
d. Descriptive
​

B. Argumentative essay

I believe it's argumentative

Explanation: the writer presents their point of view on a certain topic, gives reasons+ explanations +arguments that support his/her opinion on that certain topic... all this is a way of making the reader share the same opinion as the writer

to and without are prepositions, so a, b, and d are prepositional phrases. the adverb phrase is c, about the surprise.

explanation:

the direction of the magnetic field produced by an electric current will change when the direction of the electric current changes. for example : if a current is flowing in a straight length of wire, the magnetic field is described by a concentric circle (using right-hand rule).