Find the synonym of the underlined word.
The symptoms of "senility" include serious forgetfulness, confusion, and certain other changes in personality and behaviour.

The correct option is B Signs

'Symptoms' mean a physical or mental feature which is regarded as indicating a condition of disease, particularly such a feature that is apparent to the patient.

"dental problems may be a symptom of other illness"

In this context, "The symptoms of "senility" include serious forgetfulness, confusion, and certain other changes in personality and behaviour", 'symptoms' mean signs. Hence, option B is correct and the other options are not because they do not provide the appropriate information.