Read the passage from The Boston Cooking-School Cook Book. A small scrubbing-brush, which may be bought for five cents, and two small pointed knives for preparing vegetables should be found in every kitchen. Vegetables should be washed in cold water, and cooked until soft in boiling salted water; if cooked in an uncovered vessel, their color is better kept. For peas and beans add salt to water last half hour of cooking. Time for cooking the same vegetable varies according to freshness and age, therefore time-tables for cooking serve only as guides. Which best describes the style and tone of the passage?

An authoritative tone suggests that you are confident and knowledgeable about a particular subject.
It is a clear and precise tone that is most often used to give instructions or guidelines.
An authoritative tone indicates a sense of power and authority over the subject as well as over the reader.
However, using an authoritative tone does not mean that one has to be rude or condescending, it simply means that you know what you are talking about and you do so confidently.

The author is giving cooking instructions in this passage. The author is confident in what he has to say, and his knowledge of the subject is obvious.
There is no doubt in the author's tone.
The author here is not suggesting a course of action but being definitive about what and how things must be done in the kitchen.
Thus he uses his authority over the subject to provide information and guidelines.

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