请教一道OG题

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To map Earth’s interior, geologists use a network of seismometers to chart seismic waves that originate in the earth’s crust and ricochet around its interior, most rapidly traveling through cold, dense regions and slower through hotter rocks.

• A
  
  interior, most rapidly traveling through cold, dense regions and slower
  
  
  
• B
  
  interior, which travel most rapidly through cold, dense regions, and more slowly
  
  
  
• C
  
  interior, traveling most rapidly through cold, dense regions and more slowly
  
  
  
• D
  
  interior and most rapidly travel through cold, dense regions, and slower
  
  
  
• E
  
  interior and that travel most rapidly through cold, dense regions and slower
  
  
  
  

正确选项是C，其他倒是明白，但是through cold, dense regions这个地方cold和dense都是去修饰regions的吧，不应该用and连接平行吗？可以这样直接用逗号隔开吗？谢谢大家。大概这个问题很弱智吧hhh

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dd