In the question given below, a passage is given followed by three statements which may or may not be inferred from the passage. Select the correct combination of statements that can be inferred. Recent studies show that the population of monarch butterflies has declined drastically over the past decade. Scientists believe that the main reason behind this decline is the loss of milkweed plants, which are the primary food source for monarch caterpillars. Other factors such as climate change and the use of pesticides have also contributed to the shrinking butterfly population. Several conservation groups are now promoting the planting of milkweed to restore the butterfly population.
I. The availability of milkweed plants directly affects the survival of monarch butterflies.
II. Human activities may have contributed to the decline in the monarch butterfly population.
III. Conservation groups are indifferent to the monarch butterfly population.