In the given questions, a statement with one blank followed by three alternatives is given. Out of the given three alternatives, one or more than one can fill the given blank. Choose the set of words from the given options which can be used to fill the blank.

The lunar module curved gently down over the Sea of Tranquility, the drama heightened by the calm, ...................................

1. almost casual voices of the astronauts and the mission controller

2. the landing was perfect.

3. It was a moment of extraordinary tension and silence