6. Choose the right answer. 1. Clumsy couldn't believe his eyes because...

Analysis of Question 1:

The question asks why Clumsy couldn't believe his eyes. The provided text implies Clumsy was surprised by the squirrels' actions. Option 'a' states the squirrels were busy, which is a neutral observation. Option 'b' suggests the squirrels didn't want to hear the news, which is irrelevant to Clumsy's disbelief. Option 'c' states Clumsy had never seen such busy squirrels, which directly explains the reason for his disbelief and surprise. Option 'd' is about mushrooms and is unrelated.

Therefore, the most logical answer is (c).