The answer is C.
The story says, "Then, gently put the valve of the tube through the hole in the rim and insert the rest of the tube into the tire, being careful not to twist it."
A shift in thought can be indicated by the use of C. an em dash.
An em dash is used to set of an interruption that is closely relevant to the sentence but is not grammatically part of it. These set of interruptions can be found in a list, illustration, restatement, shift in thought or tone, summary, or dramatic point.
Semicolon (;) is used to connect independent clauses.
Ellipses (. . .) are used to indicate that material is missing in the sentence or passage.
Did you ever figure out an answer?