B .  
Nectar is not available throughout the year.
C .  
Nectar protects the honeybees from predators.
D .  
Nectar is used as a poison to kill invaders.
Answer: Option B : B
Bees do not collect nectar throughout the year. Some flowers are seasonal and therefore the bees need to wait for the season to arrive. So, they collect and store nectar.
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