Which claim is supported by the evidence that a competition can have only one winner?

a. 

students face disappointment if they lose while competing.

b. 

competitions boost confidence in all participating students.

c. 

schools should encourage students to try new things.

d. 

hardworking people do not achieve success easily.

Competitions provide boost and confidence to all participating students is the correct statement.

Option (b);

EXPLANATION:

Confidence is very important in student life as it brings motivation which leads to success. Competitions help build this confidence in students. It enhances social and emotional skills of students. Students gain interests in academics.

They teach mental toughness and one gets to know how to put their point across. Also, in sports competitions give constant urge in students to gain their skills by working harder and improve themselves. They also help students who are shy to participate in activities.

dick

explanation:

d) the narrator even suggested that the white whale, moby d, was ubiquitous and present in every ocean at every moment.