Select the option that will improve the underlined part of the given sentence. In case no improvement is needed, select 'No improvement required'.
In his memoir, Attenborough said that, "Lisa would have been 11 if she was with us today."

A

Attenborough said, "Lisa would have been 11 if she was

B

Attenborough said that, "Lisa will have been 11 if she were

C

Attenborough said, "Lisa would have been 11 if she were

D

No improvement required