Please Solve this question. Also state what is ar here

Given : A ∆ABC.

D is the mid-point of BC
and E is the mid-point of AD.

RTP : ar (∆BED) = 1/4 ar (∆ABC)

Proof : Since AD is the median of ∆ABC,

Therefore, ar (∆ABD) = ar (∆ADC)

=> ar (∆ABD) = 1/2 ar (∆ABC) ---(1)

Since BE is the median of ABD,

Therefore, ar (∆BED) = ar (∆BAE)

=> ar (∆BED) = 1/2 ar (∆ABD)

= 1/2 × 1/2 ar (∆ABC) [from (1)]

Hence, ar (BED) = 1/4 ar (∆ABC)
There answer is option B