Answer: reducing; time required for repair
Explanation:
The options to the question are:
A. increasing; reliability
B. reducing; time required for repair
C. reducing; reliability
D. reducing; reparability
E. increasing; time required for repair
If the average amount of time a product goes without failing decreased by some amount, that product's availability could nevertheless be maintained at previous levels by reducing its time required for repair.
When the time required for repair is reduced or at a minimal level, this will ensure that the product is always available.