The number of friends and family members at the party ________ amazing.

Had

Have had

Was

All are incorrect

The number of friends and family members at the party was amazing.

پارٹی میں دوستوں اور فیملی ممبرز کی تعداد حیرت انگیز تھی۔

"We use 'was' here because 'the number' is a singular noun.

Even though 'friends and family members' is plural, it acts as a unit

In this context, so we treat it as singular when discussing the number itself."