In the following questions, a part of the sentence is printed in bold. Below are given alternatives to the bold part at (1), (2) and (3) which may improve the sentence. Choose the correct alternative.In case no improvement is needed your answer is (4).
The price cannot be quoted except we are allowed to examine the sample.

Options

A. A) if
B. B) unless
C. C) because
D. D) No Improvement

Answer

B

Explanation

(2) Unless (Conj.) : except under the circumstances that
except (Conj.) : only , otherwise than
Here, unless is the right usage.