Which statement is incorrect?

An absorbed prefix is a syllable that functioned at one time in the English language as a prefix but no longer does so.
 
Concern with syllabication is approached differently in different programs. Sometimes the focus is on units of sound, with the intention of giving clues to vowel sounds, as a part of phonic analysis instruction. At other times, when syllabication practice is considered part of the structural analysis instructional component, the purpose is to demonstrate that long words may be analyzed in terms of their smaller parts.
 
A reason for being aware that the most common prefixes in the English language have been identified is to increase efficiency in teaching and transfer of learning.
 
For some time, use of context clues was assumed to be the most valuable word identification strategy. When research investigated this widely held
assumption, it was confirmed.