Directions: The first and the last sentences of the passage are numbered 1 and 6, respectively. The rest of the passage is split into four parts named A, B, C and D. These four parts are not given in their proper order. Read the sentences and find out which of the following combinations is correct.

1. Silkworms are actually a type of caterpillars that spin silk cocoons around themselves after they turn approximately 1 month old. A. The silk that is used in forming these cocoons is actually hardened silkworm saliva that is secreted from the silkworm's mouth along with the silk. B. Actually, a small spinneret located on the silkworm's lip is used to excrete the silk that they use to form their cocoon. C. At this point, it will then take silkworms approximately 3 days to spin their cocoon around themselves. D. Whenever they are finally ready to start spinning their cocoon, they will stop eating any food and then they will turn yellowish.
2. If their threads are disturbed by anything, the silkworm will have to start all over again.