Who discovered the Chicxulub Crater?

What about Chicxulub and Glen Penfield?

Is this the crater in the Gulf of Mexico?

I don't understand the answer is apparently Alvarez in the explanation but the correct answer is someone else????

nasi, the clue might be in the picture, but they've asked a question, and then don't tell you anything about the people that discovered it?

the hint is the picture 😁