The dog hid. The thunderstorm scared him. What is the best way to combine these sentences? O1 Scared, the dog hid during the thunderstorm

O2 The dog hid, when the thunderstorm scared him

O3 The thunderstorm hid the dog, and scared him

O4 The thunderstorm hid the scared dog

1- Scared, the dog hid during the thunderstorm.

Explanation:

For numbers 2, 3, and 4, the sentences do not make sense logically or grammatically. If you look at number 2, the comma shouldn't be there! It's unneeded, and makes it grammatically incorrect. With 3 and 4, they just don't make sense.  

I hope this helps!

b. our party quickly made its way into the cave / but we failed to find our host [the cyclops] himself inside.