Spot the error in the given sentence and select the correct sentence from the options given.
There were more than thirty delegates who attend the training programme last summer.

A

There are more than thirty delegates who attend the training programme last summer

B

There were more than thirty delegates who attends the training programme last summer.

C

There was more than thirty delegates who attend the training programme last summer

D

There were more than thirty delegates who attended the training programme last summer.