Which of the following sentences is correct?

• অপশনগুলোর মধ্যে সঠিক উত্তর- A million dollars is a great deal of money.

• কোনো 'পরিমাণ' বা 'অংকের একক' বুঝালে plural subject এর পরে singular verb বসে।
Example:
Ten percent is a good rate of interest.
A million dollars is a great deal of money.
Ten years is too long a time for such a walk.
Eight hours is our working day.

Source: A Passage to the English Language, S.M Zakir Hussain.