Correct Option: A

crude (Adjective) : simple and not very accurate but giving a general idea of something ; offensive or rude ; vulgar
elegant (Adjective) : attractive and showing a good sense of style; stylish
efficient (Adjective) : doing something well and thoroughly with no waste of time, money or energy
coy (Adjective) : shy or pretending to be shy and innocent ; reticent
eloquent (Adjective) : able to use language and express your opinion well ; able to express a feeling