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【单选题】
某团队希望了解焊接工艺中的温度（x1）、时间（x2）和焊锡量（x3）对焊接强度的影响，该过程已经积累的大量历史数据，该团队拟采用回归技术分析三个因素的影响程度，请问在进行回归分析时，以下哪种处理方法是正确的？（）
A.
针对焊接强度（y）对三个影响因素分别建立回归方程
B.
先分析三个因素之间的相关关系，然后用最佳子集法建立y对三个因素的线性回归模型，然后根据模型诊断结果对模型进行改进
C.
先建立y和三个因素的线性回归模型，剔除不显著的因素，即可构建所需模型
D.
先建立y和三个因素的非线性回归模型，剔除不显著因素，即可构建所需模型
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