The correct answer is d his sugar level in blood was high. Insulin is a hormone that helps the body use glucose (sugar) from the blood for energy. Injections of insulin are given to individuals with high blood sugar levels, such as those with diabetes, to help regulate blood glucose.
Why other options are incorrect:
a his blood pressure was low:
Low blood pressure, while a condition, is not directly treated with insulin injections.
b his heart was beating slowly:
Slow heart rate (bradycardia) is a separate condition, not treated with insulin.
c he was suffering from goitre:
Goitre is a swelling of the thyroid gland and is not directly treated with insulin injections.