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[smagish]

A proposal has been made to trim the horns from rhinoceroses to discourage
poachers; the question is whether tourists will continue to visit game parks and
see rhinoceroses after their horns are trimmed.
(A) whether tourists will continue to visit game parks and see rhinoceroses after
their horns are
(B) whether tourists will continue to visit game parks to see one once their horns
are
(C) whether tourists will continue to visit game parks to see rhinoceroses once the
animals' horns have been
(D) if tourists will continue to visit game parks and see rhinoceroses once the
animals' horns are
(E) if tourists will continue to visit game parks to see one after the animals' horns
have been

[adthedaddy]

Taking a step by step approach to resolve this -

The clause can begin with either "if" or "whether".
We use 'whether' when we are discussing options and use 'if' when there is a condition.
Here we're discussing options and there is no condtion. Hence, we can eliminate options (D) & (E).

Now, deciding on A,B or C -
In option (B), the "their" reference is incorrectly used. Its not clear from the sentence whether it refers to 'one' or 'tourists'

In option (A), the reference of "their" can be to 'tourists' or 'rhinoceroses'

Only option left is (C) where the usage is proper.

Ans: C

[kashishh]

C

1.)continue to...park to ..
2.) their - replaced by animal
3.) Have been - correct verb