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**Hint:**We will simplify the given definition by understanding the meaning of the different parts given in the definition. We will identify the person who stated the definition of statistics given in the question.

**Complete step-by-step answer:**We know that Statistics is that branch of Mathematics that deals with the gathering, organization, analysis, interpretation and presentation of figures or data.

(i) “By Statistics we mean aggregate of facts affected to mark extent by the multiplicity of causes,…” – this means that in statistics, we need to study the effect of all factors collectively.

(ii)“…numerically expressed, enumerated or estimated according to a reasonable standard of accuracy, collected in a systematic manner for the predetermined purpose…”. This means that data should be expressed numerically so that it can be measured, enumerated or estimated properly through precise and meaningful sentences, arranged in a systematic manner so that it can be analyzed easily. It should be collected with a purpose in our mind that we have already decided beforehand.

(iii)“…placed in relation to each other.” - Data is primarily collected for comparing 2 quantities. We should be able to find a relation between 2 quantities with the help of our data.

Professor Horace Secrist defined statistics by the statement given in the question.

**$\therefore $ Option B is the correct option.**

**Note:**Professor Horace Secrist was a very famous American Statistician. In his lifetime, he has taught at the Brigham Young University, University of Wisconsin and Northwestern University. He wrote the widely acclaimed book: An Introduction to Statistical Methods.

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