user
Some will use me, while others will not, some have remembered, while others have forgot.  For profit or gain, I'm used expertly, I can't be picked off the ground or tossed into the sea.  Only gained from patience and time, can you unravel my rhyme? What am I?
A: valence
B: im knowledge
C: racket
D: thinking
E: unexpectedly
assistant
<|begin_of_thought|>

Deep Thought is thinking for 7.5 million years.

<|end_of_thought|>

<|begin_of_solution|>

B

<|end_of_solution|>