The factory system focused on efficiency and profit by?
a.) lowering production time and costs through the use of machines.
b.)raising production time and costs through the use of machines.
c.) lowering production time and costs through the use of skilled workers.
d.)raising production time and costs through the use of young children.

The correct answer is option:

A. Lowering production time and costs through the use of machines.

The implementation of the machines increased the efficiency of capitalist production by increasing the productivity that the machines induced.

From the implementation of the machines, more goods were produced in a shorter time and with a smaller amount of labor. This has reduced production costs and increased production efficiency. As a result, profit has increased.

which statement explains one of the reasons world war 1 was so much more destructive than earlier conflicts

i am pretty sure it is a