I believe the answer is D. This is because the ":" symbol is used to list what the previous phrase was describing.
the correct answers are 1. ineffective; unanswerable, 2. ineffective; too broad, 3. ineffective; too narrow, 4. effective; clear and complex.
Answer:
When a carboxylic acid is treated with an alcohol and an acid catalyst, an ester is formed (along with water). This reaction is called the Fischer esterification. ... The alcohol is generally used as solvent so is present in large excess. i hope this helps! if it didn't please comment under me :)
Explanation: