Match list-I with list-II :

(a)	Be	(i)	Treatment of cancer
(b)	Mg	(ii)	Extraction of metals
(c)	Ca	(iii)	Incendiary bombs and signals
(d)	Ra	(iv)	Windows of X-ray tubes
		(v)	Bearings for motor engines

Choose the most appropriate answer, the option given below :

We match each alkaline earth metal with its well-known application.

Beryllium (Be) is transparent to X-rays due to its low atomic number and low X-ray absorption. It is used to make windows of X-ray tubes. This matches (iv).

Magnesium (Mg) burns with a brilliant white light in air. This property makes it useful in incendiary bombs and signal flares. This matches (iii).

Calcium (Ca) is a strong reducing agent and is used in the extraction of metals through metallothermic reduction, for example in extracting uranium, vanadium, and chromium from their compounds. This matches (ii).

Radium (Ra) is radioactive and emits alpha, beta, and gamma radiation. It was historically used in the treatment of cancer via radiation therapy (brachytherapy). This matches (i).

The correct matching is a - iv, b - iii, c - ii, d - i, which corresponds to Option B.