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For some birds the sense of smell appears to play a role in [#permalink]
15 Sep 2005, 14:02
0% (00:00) correct
0% (00:00) wrong based on 0 sessions
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
B it is!
there is no supporting evidence of varying levels of difficulty, so the options with "increasing" are out. The difficulty part refers to a single action - that of homing. So, the options with difficulties are also out. I was left with B, even though the usage of verbs there reads a little odd at first.