The abbreviation for a soft,very heavy metal used for shielding against x-rays is:

A) R.
B) Ba.
C) Ra.
D) Pb.

Shielding

The use of materials to protect against harmful radiation by absorbing or blocking it.

X-rays

A form of electromagnetic radiation used in medical imaging to view the inside of the body.

Pb

The chemical symbol for lead, a dense, toxic metal used in various applications.