He is a (an) _____ grandfather. He often spends all his free time with his grandson. [ ]

A. lovely

B. loving

C. creative

马克思主义伦理学认为，道德是人类特有的，由（）关系决定的，依靠内心信念、社会舆论和风俗习惯等方式来调整人与人之间，人与社会之间以及人与自然之间的关系的特殊行为规范的总和。