Select the most appropriate option to substitute the highlighted segment in the given sentence:
Experts acknowledged that some counterfeiting of document techniques are virtually impossible to detect.

Correct option is B

The correct substitution of the highlighted word is (b) forgery.
Explanation: "Forgery" refers to the act of producing fake documents, which fits the context of counterfeiting techniques.
Grammatical rule used: Replace a word with a precise synonym that aligns with the sentence's context.
Example: The bank detected a case of forgery in the submitted documents.
Meanings of other options:
· fiasco: A complete failure (Hindi: असफलता)
· impromptu: Without preparation (Hindi: तुरंत)
· frenzy: Uncontrolled excitement (Hindi: पागलपन)