user
My first is a creature whose breeding is unclear.   My second, a price you must pay.    My whole can be found in the river of Time and refers to events of today.   What am I?
A: current
B: history
C: story
D: oil
E: delta
assistant
<|begin_of_thought|>

Deep Thought is thinking for 7.5 million years.

<|end_of_thought|>

<|begin_of_solution|>

A

<|end_of_solution|>