A
句意：通过写这篇文章，作者高度赞扬了友谊。
A 友谊 B 父母 C 宗教 D 文化
根据文章倒数第二段：
Through tear-blurred eyes, I recognized the handwriting of Jill, a friend I had met just two months before. I later discovered that the old man was her father. Jill had seen the hurt inside the girl and decided to do something about it.
(透过泪水模糊的眼睛，我认出了吉尔的笔迹，她是我两个月前认识的朋友。后来我才知道那个老人是她的父亲。吉尔看到了这个女孩内心的伤痛，决定做点什么。)
以及本文的最后一段：
So now I believe that Santa is real. I don't mean the twinkle-eyed character of children's mythology(神话) or the creation of American holiday marketers. Those Santas annoy(使…… 厌烦) and sadden me. I believe in the Santa Claus that lives inside good and thoughtful people. This Santa does not return to the North Pole after sending kids gifts but lives each day purposefully, really listens to friends, and then plans acts of kindness.现在我相信圣诞老人是真的了。我指的并不是儿童神话里那种闪闪发光的角色，也不是美国节日营销人员创造出来的。那些圣诞老人让我烦恼(......)，让我难过。我相信圣诞老人住在善良体贴的人心里。这位圣诞老人在给孩子们送完礼物后不会回到北极，而是有目的地过好每一天，真正倾听朋友们的心声，然后计划做一些善事。
可知，是作者的朋友Jill最终治愈了作者，并因此作者对友谊发出了高度的赞扬。
故答案选A
