In the olden days, shopkeepers used to dupe the ________ customers by attacking removable magnetic weights _______ their weighing instruments.

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Step 1 — Role of the first blank:

The first blank modifies "customers" and must describe those who can be easily cheated. The adjective $innocent$ precisely conveys people who are unsuspecting and easily duped.

Step 2 — Role of the second blank:

The second blank requires a preposition indicating where removable magnetic weights would be placed to tamper with a scale. The preposition $under$ correctly describes placing weights beneath the weighing instruments to alter their readings.

Step 3 — Combined sense:

Reading the sentence with the chosen words: "In the olden days, shopkeepers used to dupe the $innocent$ customers by attaching removable magnetic weights $under$ their weighing instruments." This is grammatically coherent and semantically accurate: shopkeepers cheat unsuspecting customers by placing hidden weights beneath scales to falsify measurements.

FINAL_ANSWER: d

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