What is a characteristic of branched chained alkanes?

The missing options are as follow,

A) They have one or more rings of carbon atoms.
B) They have carbon atoms that are double-bonded to other carbon atoms.
C) They have more than two carbons that are bonded to only one other               carbon.
D) They have carbons bonded in a single row from one end of the molecule         to the other end of the molecule.

            Option-C (They have more than two carbons that are bonded to only one other carbon) is the correct answer.

Explanation:
                   Branched chain hydrocarbons are those hydrocarbons which at least contain one tertiary carbon atom. Tertiary carbon atoms are those carbons which are at least attached to three carbon atoms, or we can say that the carbon to which more than two carbon atoms are attached. Following figure shows different branched hydrocarbons with tertiary and Quaternary (attached to four carbon atoms) carbons highlighted in red.

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