So while such an attack and its aftermath would not reduce our eventua
Right Answer is: B
The underlined segment must be replaced with option B. Let’s first learn the meanings of the words:
Derail = to prevent a plan or process from succeeding.
Herald = person or thing viewed as a sign that something is about to happen.
Retrench = reduce (something) in extent or quantity.
Hence, option B is the correct answer.