his sentence is incorrect because it uses "himself" incorrectly. "Weighed" does not require a reflexive pronoun in this context, and "maunds" is not used appropriately here.
This is the correct sentence. It clearly indicates that the weight of the person is being expressed in maunds, a unit of measure. The structure is grammatically sound.
This sentence is incorrect because "themselves" is a plural reflexive pronoun, which does not agree with the singular subject "He." Additionally, the phrase "weighed themselves two" is not a correct construction.
This sentence is incorrect for similar reasons. "Itself" is a reflexive pronoun that is used for non-human subjects or objects, which does not fit the context of "He." The structure is also awkward.
This is the correct sentence. It clearly indicates that the weight of the person is being expressed in maunds, a unit of measure. The structure is grammatically sound.