You work for a major company and have received an email from a colleague that will require you to spend a few days putting together information. Your best course of action is to a.
Send a quick reply telling your colleague when you will have the information (and then be on time getting that information to your colleague)

b.
Reply in a few days once you have put together the information

c.
Ignore the email

d.
Reply with a quick description answering your colleague’s main question but ignore the part that will take you extra work