A. Wasn't.. This is because if you seperatevthe contractioninto two words it is was not, this would make the sentence be "Wally was not capable of lifting the heavy box."
If you were to do the same thing with weren't it would sound like "wally were not capable of lifting the heavy box." This does not make sense because "wally" is singular (so is "was not") and "were not" is pleural.
Hope this helps
Answer:The most likely answer for this question would be D
Explanation: Pondering typically involves the process of carefully thinking of a process for large span of time, and in this case he is doing exactly that.
Hope this helps! :D
