Every Year, Environmental Signals in Africa Cause Flycatchers to Return

Every year, environmental signals in Africa cause flycatchers to return to the Netherlands to breed. When they arrive, they depend on freshly hatched caterpillars for food. Global climate change has caused the caterpillars to hatch earlier in the Netherlands, but the environmental cues in Africa remain the same. Now, when the flycatchers return to the Netherlands the caterpillars are no longer available as a food source. Which of the following is likely to happen to this species of flycatcher?

A) Flycatchers will adapt to environmental change because alleles that cause flycatchers to recognize earlier environmental signals in Africa will increase in frequency in flycatcher populations.
B) Flycatchers will adapt to environmental change because alleles that aid flycatchers in utilizing other food sources (besides caterpillars) will increase in frequency in flycatcher populations.
C) Flycatchers will not adapt to environmental change because their population does not have alleles that aid in survival under these conditions.
D) All of the above are possible scenarios.