Question 1 Writing and Language: Science Practice Test for the SAT® exam

Which choice for the underlined material marked [1] best maintains the sentence pattern already established in this paragraph from the attached passage?

“Measuring the dimensions of your science class is not a difficult task. All that is required is to obtain a tape measure and stretch it across the length and width of the floor. Finding the perimeter of your school’s athletic field, though offering a bit more of a challenge, is nonetheless within the realm of possibility. [1] A different method must be used, however, to find the distances between stars and galaxies.