Select the most appropriate word to fill in the blank.
_______________ his previous start-ups have failed.

The correct answer is (d) All.
Explanation: The sentence suggests that the subject is talking about all of his previous start-ups, implying none of them have succeeded. The word "All" fits this context best.
Meanings of all options:
· Little: A small amount.
· Quite: To a certain degree or extent.
· Very: Emphasizes the degree of something.
· All: Refers to the whole quantity or extent of something.
Correct sentence: " All his previous start-ups have failed."