Select the most appropriate option to fill in the blank.
Very special care should be taken to proportion the sand so as to make a perfectly _____ mixture.
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. impervious.
- "Impervious" is the best choice because it describes a mixture that is resistant to penetration, which is important for achieving the desired quality.
- The other options-"devious," "obvious," and "envious" do not fit the context of making a mixture with specific properties.