Read the passage carefully and give the answer of following questions. 

The situation of Columbus was daily becoming more and more critical. In proportion as he approached the regions where he expected to find land; the impatience of the crew augmented. The favourable signs which increased his confidence were derided by them as delusive; and there was danger of their rebelling and obliging him to turn back, when on the point of realising the ob them a mere watery desert surrounding the habitable world. What was to become of them should their provisions fail? Their ships were too weak and defective even for the great voyage they had already made, but if they still were to press forward, adding at every moment to the immense expanse behind them, how should they ever be able to return, having no intervening part where they might victual and refit? Where they to sail on until they perished.

ject of all his labours. They beheld themselves with dismay still wafted onward, over the boundless wastes of what appeared to  or until all return became impossible? In such case they would be the authors of their own destruction. 

Q:

'In such case' in the last line in the passage refers to

• 1
  the weak and defective ship
• 2
  the destruction of the authors
• 3
  sailing on until they reached land
• 4
  sailing on until they perished on until all return became impossible