The error in the statement is option A. The correct sentence will be: Although a number of police officers were guarding the priceless treasures in the museum, the director worried that someone would try to steal them.
<h3>What is meant by priceless treasure?</h3>
It is seen as a thing or artwork that is said to be very valuable and it is one which no one would ever want to sell it or be able to buy easily.
Note that the item that is known to be a priceless things are the ones that cannot be bought sometimes, and they are often kept in the museum.
<h3>What is the verb about?</h3>
The verb "Was" is known to be a verb that is often used in the first person singular and also the third person singular while the term "Were" is often used in the second person singular and also in plural form.
Since the police officers were more than one it is necessary to use the verb ''were guarding" instead of was "guarding"
Hence, The error in the statement is option A. The correct sentence will be: Although a number of police officers were guarding the priceless treasures in the museum, the director worried that someone would try to steal them.
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Pin-point Error- Although a number of police officers was guarding/A the priceless treasures in/B the museum, the director worried that someone would try to/C steal/D them.
A
B
C
D