在参数估计中，要求通过样本的统计量来估计总体参数，评价统计量标准之一是使它与总体参数的离差越小越好。这种评价标准称为（ ）。

A、<span style="FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-bidi-font-family: ">无偏性</span>

B、<span style="FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-bidi-font-family: ">有效性</span>

C、<span style="FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-bidi-font-family: ">一致性</span>

D、<span style="FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-bidi-font-family: ">充分性</span>