90 points and whoever does it right gets brainliest scientists use potassium-argon method to determine the age of a rock sample. three separate tests showed the rock to be 1.3 billion years old. however, scientists know the rock must be at least 2.5 billion years old based on the rocks around it. how is this possible? the radiometric dating was off due to loss of daughter isotopes. the relative dating was off due to the loss of daughter isotopes. the relative dating was done incorrectly. the radiometric dating was done incorrectly.

Option C, The relative dating was done incorrectly.

Explanation:

As it is mentioned here in the description that scientist know that the actual age of rocks must be 2.5 billion years and this age of the rock must have been derived through some methodology of radioactive dating. Now since the potassium-argon method was used three times and it depicted the same result every time stating that the age of rocks is 1.3 billion years. Therefore there are high chances that earlier method used that estimated the age of rock as 2.5 billion years must be wrong.

your answer is "the 1950's"