Answer:
A. understand that managing the moon landing while the lunar module had 30 seconds left of fuel required intense concentration.
Step-by-step explanation:
From the excerpts given, it is mentioned that the lunar module was out of fuel and had less than thirty seconds of fuel left and as a result, the margin of error was very slim or even nonexistent.
This put pressure on the control tower as they had to keep their focus, knowing that any mistake would be fatal.