Which paragraph contains the following information?
Write the correct letter, A–F, in boxes 27–31 on your answer sheet.
27 a use for helium which makes an activity safer
28 the possibility of creating an alternative to helium
29 a term which describes the process of how helium is taken out of the ground
30 a reason why users of helium do not make efforts to conserve it
31 a contrast between helium’s chemical properties and how non-scientists think about it