Which theme is developed in The Hobbit when Bilbo spares Gollum's life? O Trying to understand the feelings of others is a form of courage.
O Heroes come in all shapes and sizes.
O The freedom to make mistakes can lead to innovation.
O Challenges often reveal one's inner weaknesses.

Trying to understand the feelings of others is a form of courage.

Explanation:

'The Hobbit' is a novel written by J. R. R. Tolkien. The novel is about the quest of Bilbo Baggins.

In Chapter 5, Riddles in the Dark, of book 'The Hobbit', Bilbo met Gollum in the cave. Gollum was a small slimy creature, who lived alone in the caves and preyed upon fish and goblins. Gollum was the master of the invisible ring.

After Bilbo found the invisible ring, he put it on to run away from the cave without being seen by goblins. But Gollum smelled Bilbo and tried to stop his way. At this point, Bilbo, who was invisible, spared Gollum's life, who tried to harm him, because he considered it to be unfair as he was invisible and Gollum without sword. Then he began understand the situtation of Gollum, who lived a miserably alone life in cave, therefore, he leaped over Gollum and left the cave.

This action reveals the theme that trying to understand other's feeling is a form of courage. Therefore, option A is correct.

faulty parallelism is a construction in which two or more parts of a sentence are equivalent in meaning but not grammatically similar in form.

the correct version of this faulty parallelism in the sentence is:

the hikers knew that the hike was six miles, that it usually required the entire day, and it would not be wise to start after 10: 00 a.m.

the problem is the last sentence, the first two have a basic subject+verb+object structure.

so, to give a proper balance to the structure, or better said, to give a parallel structure, we must write a basic s+v+o structure in all three sentences:

the hikers knew that the hike was six miles, that it usually required the entire day, and it would not be wise to start after 10: 00 a.m.

the answer is not