The extraneous sentence that should be deleted is (4) "My favorite roller coaster in Texas has a drop that is over 200 feet long." This sentence does not contribute to the main discussion about the elements of roller coaster design, such as safety and excitement.
Which sentence is extraneous and should be deleted?
(1) Speed alone is not enough for a fantastic roller coaster, though. (2) Designers often add loops and twists to rides. (3) However, roller coasters must be safe as well as exciting. (4) My favorite roller coaster in Texas has a drop that is over 200 feet long. (5) Friction and gravity are key factors in determining how far designers can push the limits of a ride. (6) Will the cars have enough speed to complete the loop? (7) Will the cars move too fast to stay on the track during an abrupt turn? (8) These are questions designers must use science to answer.
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