Given below are four sentences, three of which. are jumbled. Pick the option that gives the correct order.
A. Monarch butterflies are important pollinators, but their global population is falling.
B. Scientists think that habitat loss and pesticides probably caused this.
C. There was an 86% fall in the number of butterflies that they saw.
D. In California, an organisation found that there were very few monarch butterflies visiting during this 2018 winter.