Which construction would Churchill pause if forced to choose?

If Churchill could pause only battleships or carriers, which would he choose?

The reply thinks he would pause battleships because of existing strength and concern about air power.

The follow-up makes the choice between battleships and carriers explicit. The answer tentatively selects battleships. It reasons that existing battleships offered some security while anxiety about air power strengthened the case for completing carriers. This is a conditional judgment within the earlier construction scenario.