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# For some birds the sense of smell appears to play a role in

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Director
Joined: 16 May 2007
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For some birds the sense of smell appears to play a role in [#permalink]

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05 Jul 2007, 19:42
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For some birds the sense of smell appears to play a role in navigation, since pigeons with surgically removed olfactory nerves were found to have increased difficulties in homing.

A. were found to have increased difficulties

B. have been found to have increased difficulty

C. were found to have increasing difficulty

D. had been found to have increased difficulties

E. have been found to have increasing difficulties
GMAT Club Legend
Joined: 07 Jul 2004
Posts: 5045
Location: Singapore
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05 Jul 2007, 20:18
A,C - out
D - 'had been' is wrong
E - 'increasing difficulties' is awkward

B is best.
Manager
Joined: 29 Jan 2007
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06 Jul 2007, 14:29
B .

past tense is ruled out because the birds still have problem.

~sara
06 Jul 2007, 14:29
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