My answer is(E) . It took me 48 seconds.
(E) is chosen mainly because it is concise and clear.
(A) is a cleft sentence that emphasizes "anomalies in the orbit of Uranus". Whether the author intends to make such emphasis is hard to discern in this sentence. The decision to discard (A) in favor of (E) is not one that can be tightly defended. Still, shorter is better.
(B) Worse than (A) with "showing anomalies"
(C) See above.
(D) "X is what led B" is wordier than
...
(E) is chosen mainly because it is concise and clear.
(A) is a cleft sentence that emphasizes "anomalies in the orbit of Uranus". Whether the author intends to make such emphasis is hard to discern in this sentence. The decision to discard (A) in favor of (E) is not one that can be tightly defended. Still, shorter is better.
(B) Worse than (A) with "showing anomalies"
(C) See above.
(D) "X is what led B" is wordier than
...
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