__________ is a flexible material and it is easy to lay & is available in rolls of normal wall width.
(a) Hot bitumen
(b) Metal sheets
(c) Mastic asphalt
(d) Bituminous felts
The question was asked in an interview for job.
Enquiry is from Dampness topic in chapter Damp Proofing, Water Proofing and Termite Proofing of Construction & Building Materials