Question

review the details below.
hawaiian surfers george freeth and duke kahanamoku helped establish the sport in california, australia, and new zealand.
the first surfboards were made of solid wood, but in the 1930s, american tom blake developed a cheaper, lighter version that attracted new surfers.
surfing, popular in pre - colonial hawaii, was used to attract tourists visiting waikiki beach in the early twentieth century.
choose the best topic sentence to introduce a paragraph containing these details.
surfing had limited widespread appeal until hawaiian surfers helped popularize the sport.
a number of factors influenced the spread of surfings popularity in the early twentieth century.
although once limited to a few areas, surfers have found excellent surfing conditions all over the world.

Explanation:

The details discuss how Hawaiian surfers spread the sport, surfboard innovations attracting new surfers, and surfing used to attract tourists—all factors influencing surfing's popularity in the early 20th century. The first option focuses only on Hawaiian surfers, the third on global surfing conditions (not the details given). The second option encompasses multiple factors (surfers, equipment, tourism) affecting popularity in that era.

Answer:

B. A number of factors influenced the spread of surfing's popularity in the early twentieth century.