Raczej "A". Tocharian A, represented in manuscripts from the Turfan i Karashahr region, also known as Agnean; and Tocharian B, represented in manuscripts from Kucha, and therefore called Kuchean. Np:
http://en.wikipedia.org/wiki/Tocharian_languages. Patrz też: Some sources therefore refer to Tocharian A as East Tocharian or Turfanian, since Turfan is at the easternmost extent of the Tocharian sites. Occasionally it is termed Agnean, referring to the Sanskrit designation Agni for Qārāšahr. In this context, Tocharian B is referred to as West Tocharian (though it is found in the east, too) or Kuchean.
http://www.utexas.edu/cola/centers/lrc/eieol/tokol-0-X.html. Przy okazji: czy dawne królestwo Kucha (patrz alternatywne nazwy w :
http://en.wikipedia.org/wiki/Kucha) tłumaczy się na polski jako "Kucza"?