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Herds for breeding stock is plural and pronoun 'their' must go with it. That cuts down option D and E. Next we need parallel noun phrase for " a fortification". Only option B matches -parallel noun phrase, correct pronoun usage and maintains the meaning of the sentence.

IMO answer is option B

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William Hornby acquired bison herds for breeding stock hoping that this move would eventually lead to increasing in their numbers, and a fortification of their environment.

William acquired bison herds in the hope that breeding would increase the numbers of bison.

A. increasing in their numbers, - WRONG. To + verb-ing is incorrect.
B. an increase in their numbers, - CORRECT.
C. their increase in numbers, - WRONG. Non - sensical
D. an increasing in numbers, - WRONG. ‘increasing in’ is incorrect.
E. an increasing in the numbers of them, - WRONG. Same error as in ‘D’.

Answer (B).
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A. increasing in their numbers,
--increasing in their numbers, and a fortification of their environment.
---not parallel (incorrect)

B. an increase in their numbers,
--an increase in their numbers, and a fortification of their environment.
--perfectly parallel and express the intended meaning (correct)

C. their increase in numbers,

---awkward construction ---bison herds increase in numbers--does not make sense--increase in their number express the logical meaning (incorrect)

D. an increasing in numbers,
--increasing is incorrect over here--increase is required
---also it is not clear whose numbers are increasing (incorrect)

E. an increasing in the numbers of them
--increasing is incorrect
---numbers of them - this is not the correct way and wordy--their numbers would be preferred over this (incorrect)
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Imo B ...
Lead to an incraese in their numbers...

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A. increasing in their numbers,...increasing...wrong
B. an increase in their numbers, both perfect
C. their increase in numbers,......their missing
D. an increasing in numbers,......their missing
E. an increasing in the numbers of them,.....awkward
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Bunuel

Competition Mode Question



William Hornby acquired bison herds for breeding stock hoping that this move would eventually lead to increasing in their numbers, and a fortification of their environment.

A. increasing in their numbers,
B. an increase in their numbers,
C. their increase in numbers,
D. an increasing in numbers,
E. an increasing in the numbers of them,

Official Explanation



Correct Answer: B

The best answer is B. Choice B clearly and correctly uses parallel noun phrases to list the effects of Hornby's actions: an increase in... a fortification of
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