The correct answer is: B. Only either I or IV, and III follow
The first statement is “All benches are desks.” This means that every bench is a desk. The second statement is “Some desks are roads.” This means that there are some desks that are also roads. The third statement is “All roads are pillars.” This means that every road is a pillar.
From the first statement, we can conclude that some benches are roads. This is because if all benches are desks, and some desks are roads, then some benches must also be roads. This is conclusion I.
From the second statement, we can conclude that some roads are pillars. This is because if some desks are roads, and all roads are pillars, then some roads must also be pillars. This is conclusion III.
However, we cannot conclude that some pillars are benches. This is because the first statement only says that all benches are desks, not that all desks are benches. It is possible that there are desks that are not benches. Therefore, we cannot conclude that there are pillars that are benches. This is conclusion II.
We also cannot conclude that no pillar is a bench. This is because the first statement only says that all benches are desks, not that all desks are not benches. It is possible that there are benches that are not desks. Therefore, we cannot conclude that there are no pillars that are benches. This is conclusion IV.
Therefore, the only conclusions that follow from the given statements are I and III.