Correct option is A
The correct order of the sentences to form a meaningful paragraph is
(a) BDAC.
B. During the spring of 1717, the iron foundries in a remote district were often visited by a thin, middle-aged man with a notebook.
· This sentence provides the context of the time and place when the experiment took place, mentioning the man's visits to iron foundries.
D. He would weigh out two pounds of iron, have them heated till they were red-hot and then weigh them again.
· This sentence explains the specific steps of the experiment, involving weighing and heating iron.
A. He repeated the experiment, increasing the amount until he had weighed up to a thousand pounds.
· This sentence introduces a man conducting an experiment where he repeatedly weighs iron and gradually increases the amount he weighs.
C. Three cauldrons were next prepared under his directions.
· This sentence indicates the preparation of three cauldrons, likely for a part of the experiment, under the man's guidance.