A client with diabetes in the second trimester of pregnancy, notes that the usual dose of insulin to maintain blood glucose levels has been increasing over the last few weeks. What would the nurse explain to the client about insulin during pregnancy?

Insulin resistance develops because of human placental lactogen hormone and other hormones.

The fetus is using insulin to maintain adequate blood glucose levels in utero.

An increase in circulating blood volume during pregnancy makes insulin less available.

The change in diet causes an increased need for insulin to maintain normal blood glucose levels.