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_______ are used as rocket propellants in olden days.

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_______ are used as rocket propellants in olden days.

(a) solid fuels

(b) liquid fuels

(c) petroleum

(d) gaseous fuels

The question was asked in an international level competition.

My question comes from Solid Fuels topic in chapter Fuel Technologies of Applied Chemistry

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Correct choice is (a) solid fuels

For explanation I would say: Solid fuels are used in rocket fuels. Gun powder is the main solid fuels that is mostly used in the rockets in the early stages but now we are using mostly liquid fuels as they have more efficiency than solid fuels.

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