Question

the adult human brain is thought to have as many as ____ synapses.
100 million
100 trillion
100 billion

Explanation:

The adult human brain's synaptic count is a well - known biological fact. Scientific research indicates that the adult human brain is thought to have around 100 trillion synapses. The option of 100 million is too low, and 100 billion is also lower than the established scientific understanding of the synaptic count in the adult human brain.

Answer:

B. 100 trillion (assuming the options are labeled as A. 100 million, B. 100 trillion, C. 100 billion)