If Patricia eats a heavy, spicy meal tonight, she will get a bad case of heartburn later. If Patricia gets a bad case of heartburn later, she will be grouchy tomorrow morning. So if Patricia eats a heavy, spicy meal tonight, she will be grouchy tomorrow morning. Which one of the following arguments is most similar in its logical features to the argument above?The argument uses a simple conditional chain: if A happens, B happens; if B happens, C happens; therefore, if A happens, C happens.
The structure is if A, then B; if B, then C; therefore, if A, then C.
(A) If Ruth plants only daffodils, the squirrels will eat the bulbs. If the squirrels eat the bulbs, then no flowers will bloom in Ruth's garden. Since no flowers are blooming in Ruth's garden, she must have planted only daffodils.
This is not parallel. It starts with the same kind of chain, but then wrongly concludes that the first condition occurred because the final result occurred.
(B) If Shawn starts gardening in early spring, he can plant tomatoes early. If Shawn can plant tomatoes early, he will have plenty of tomatoes for canning. But he does not have plenty of tomatoes for canning, so either he did not start gardening in early spring or he did not plant tomatoes early.
This is not parallel. It reasons from the absence of the final result back to the possible absence of earlier conditions, while the original argument moves forward from the first condition to the final result.
(C) Maria plants either petunias or geraniums in her garden. If Maria plants petunias, she plants purple ones. If Maria plants geraniums, she plants red ones. Since both petunias and geraniums are flowers, Maria will have either purple or red flowers in her garden.
This is not parallel. It uses an either/or setup and two separate conditionals, not one continuous chain.
(D) If Li plants old rose varieties, her garden will look beautiful. If Li's garden looks beautiful, Li's neighbors will be impressed. So if Li plants old rose varieties, her neighbors will be impressed.
This is correct. It has the same structure: if Li plants old rose varieties, her garden will look beautiful; if her garden looks beautiful, her neighbors will be impressed; therefore, if she plants old rose varieties, her neighbors will be impressed.
(E) If Bryan's fruit trees are to produce well, he must either prune them in the fall or fertilize them in the spring. Since Bryan wants his trees to produce well but forgot to prune them last fall, Bryan is sure to fertilize his trees this spring.
This is not parallel. It involves alternative requirements and a prediction about what Bryan will do, not a simple conditional chain.
Answer: (D)