Obstetric sonography is a technology that allows doctors and parents to see images of a fetus as it develops in a woman’s womb. this practice is commonly referred to as an ultrasound. generally, a woman will get two or three ultrasounds during her pregnancy. which is the most likely medical reason that a doctor might require a pregnant woman to get ultrasounds more frequently?

to predict the due date
to gather pictures for an album
to prepare for special medical needs
to find out the gender of the baby

Option C

Explanation: The obstetric sonography is a medical technology which is used by the doctors to get the image of the fetus in mother's womb. This procedure is repeated frequently.

The reason behind this is that the fetus developing in the mother's womb might get suffer with some disorders. As the fetus is not visible the disorders cannot be seen or treated.

So, this technology allows us to visualize the image of the fetus and prepare the medical needs before its birth.

the answer to your question is b

the answer is; comparing the frequency of collisions with and without the device

this makes the anti-collision system an independent variable and the collisions a dependent variable. if there are fewer collisions with an anti-collision system that without, then it can be stated that the system is a success. essentially, collisions under an anti-collision system are compared with the frequency of collisions by cars with the human drivers.