Which one of the following statements is correct:
$(i)$ Baculoviruses are excellent candidates for species-specific,narrow-spectrum insecticidal applications.
(ii) Bacillus thuringiensis is used to control butterfly caterpillars.
(iii) Ladybird is useful to get rid of mosquitoes.
(iv) Trichoderma fungus is used as a biocontrol agent for animal pathogens.

• A
  only $(i)$,(iii) and (iv)
• B
  only $(i)$ and (ii)
• C
  only (ii) and (iv)
• D
  only (iii) and (iv)