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 correct answer is 4) heat and pressure

metamorphic rocks arise from transformation of existing rocks types, in a process called metamorphism. during metamorphism the original rock(prolith) change into metamorphic rock by heating (150-200c) and pressure of more than 1000 bar. the original rock can be sedimentary, igneous, or existing metamorphic rock.