Answer:
B. Cardiogram
Step-by-step explanation:
In the formation of multisyllabic words, prefixes are sometimes combined with root words and suffixes. The word, cardiogram, is combined with the root word, 'cardi/o', which literally translates to heart. 'Gram' is a suffix that literally translates to record.
The word cardiogram means a record of the muscular activity within the heart. It is usually expressed in a visual form (electrocardiograph) indicating the rise and fall of the heartbeats. So, literally, the word 'cardiogram' translates to 'heart writing' or 'heart record'.