Which of the following sentences contains a conjunction?
A. The shovel was placed against the house.
B. My grandfather told me all about his childhood.
C. I hid my journal beneath the bed.
D. I finished mowing the lawn and I took a long nap
The conjunction in this sentence is "and," which connects two independent clauses, indicating a relationship between the actions of finishing mowing the lawn and taking a long nap.
Therefore, the Correct Answer is D.