Q:

(A) There were some attempts at development of vaccines against SARS and the MERS
(B) There are no licensed vaccines for any coronavirus yet.
(i) Although there were some attempts at development ________.
(ii) Unless there were some attempts at development________.
(iii) In spite of no licensed vaccines for any coronavirus________.

• 1
  Both (i) & (ii)
• 2
  Only (i)
• 3
  Only (iii)
• 4
  Both (ii) & (iii)
• 5
  None of these