וַתָּמָת שָׂרָה, בְּקִרְיַת אַרְבַּע הִוא חֶבְרוֹן--בְּאֶרֶץ כְּנָעַן; וַיָּבֹא, אַבְרָהָם, לִסְפֹּד לְשָׂרָה, וְלִבְכֹּתָהּ.
And Sarah died in Kiriatharba--the same is Hebron--in the land of Canaan; and Abraham came to mourn for Sarah, and to weep for her.
The word V'Livkosa is written with a small Kaf in the Sefer Torah. Baal HaTurim explains that Avraham only cried a little bit and therefore there is a small Kaf. According to this explanation, why was the Kaf selected to be the small letter and not the Lamed, the Bais, the Taf, or the Hai? Is there a reason the Kaf was selected over the word's other letters?