Final answer:
The sentence with an incorrect verb shift is 'He swims to the end of the lane and touched the wall', which mixes present tense ('swims') with past tense ('touched').
Step-by-step explanation:
The sentence with an incorrect verb shift is C. He swims to the end of the lane and touched the wall. The error is that the verb 'swims' is in the present tense, and 'touched' is in the past tense.
To correct the sentence and maintain consistency in verb tense, it should be either 'He swims to the end of the lane and touches the wall' if the action is ongoing or 'He swam to the end of the lane and touched the wall' if the action is completed in the past.