Step 1: Subject analysis.
"Each" makes the subject singular.
Step 2: Apply singular verb.
Singular subject → singular verb: "gets."
Step 3: Eliminate options.
(B) get – plural, incorrect.
(C) getting – wrong form.
(D) can got – grammatically wrong.
Identify the part of the sentence that contains a grammatical error:
Each of the boys have submitted their assignment on time.