Sample 1 shows an equal amount of rubidium and strontium. Sample 2 shows three times more lead than thorium.

Which statement correctly identifies the older rock sample and provides an accurate explanation?

A
The rock in Sample 1 is older because it has a longer half-life value.

B
The rock in Sample 2 is older because it has been through two half-lives.

C
The rock in Sample 1 is older because it contains more of the original element.

D
The rock in Sample 2 is older because it contains less of the original element