Answer:
A) having bilateral conformity in size or shape
Step-by-step explanation:
Suffixes are extensions added to the end of the word in order to make another word, connected to the basic one.
The basic word here is the noun, symmetry, which here is defined as bilateral conformity in size or shape.
Adding the suffix -ical to this word, we get the word symmetrical, an adjective. When something is symmetrical, it means it has the symmetry, or has bilateral conformity in size or shape.
Answer B) is the definition of a word that shows the way in which something is done, meaning it defines an adverb.
Answers C) and D) are definitions of words that shows (the process of) making something become symmetrical, which means they define verbs.
Since symmetrical is an adjective, these answers are incorrect.