In the 1960s, new evidence support the theory of continental drift and change it into the theory of plate tectonics. what was this new evidence? rock patterns and glacial deposits in similar climates. the african and south american coastlines are similar, providing evidence of their common origin. fossils disproving the continent of pangaea. the location of the plates was determined by locating their boundaries, using data on the earth’s magnetic field.

I would have to say the first option.

Due to the fact that Africa and South America do not have similar coasts, fossils prove that used to be the continent of Pangaea, and location of the plates had boundaries, but they were not affected by Earth's magnetic fields.

the level of progesterone is low at the pre-ovulatory phase of the cycle but it gradually increases and the levels are high at the luteal phase. if pregnancy occurs, the level of progesterone will be high throughout the pregnancy.

if egg is fertilized and the mother gets pregnant, progesterone starts preparing the uterus for the implantation. it starts building up the lining of uterus and make it hostile of the period of pregnancy.