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How is the piston crown created in a direct injection to help a minimum of air and fuel before combustion?

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in Automotive Engine Design by (137k points)
How is the piston crown created in a direct injection to help a minimum of air and fuel before combustion?

(a) Scavenged

(b) Swirling vortex

(c) Plain

(d) Circle

I had been asked this question in an international level competition.

I would like to ask this question from Petrol Injection topic in section Petrol Engine Fuel Supply System of Automotive Engine Design

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The correct choice is (b) Swirling vortex

Explanation: In a direct injection the piston crown is designed in such a way that it creates a swirling vortex to help mix the fuel and air before combustion. The piston crown also has a cavity on it for ultra-lean-burn conditions.

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