In the following sentence four words or phases are underlined. If there is any mistake with regard to grammar or usage, it's in the underlined part only. Identify the incorrect part.

$\underset{A}{\underset{–}{\text{The hope}}}\text{to}\underset{B}{\underset{–}{\text{go through}}}\text{the book today.}\underset{C}{\underset{–}{\text{I have}}}\underset{D}{\underset{–}{\text{almost read}}}\text{half of it}.$

The correct option is B.

Reason: The phrase 'the hope' contains the verb 'hope'. But, the phrase does not form a complete meaningful sentence, as there is no doer; which is the 'subject'. Hence, the correction is: I hope to go through the book today.

So, the error is 'the'.