Match the following options correctly:

(a)- iii, (b)- iv, (c)- i, (d)- ii

The correct answer is Option 4: (a)- iii, (b)- iv, (c)- i, (d)- ii

(a) Golden Quadrilateral → (iii) The National Highways Authority of India (NHAI). The Golden Quadrilateral project was implemented by the National Highways Authority of India.

(b) Narrow gauge → (iv) Confined to hilly areas. Narrow gauge railways are mainly used in mountainous and hilly regions.

(c) Broad gauge → (i) Distance between rails is 1.676 meters. Broad gauge in India has a rail distance of 1.676 metres.

(d) Shahi road → (ii) Grand Trunk (GT) road. The historic Shahi Road later became known as the Grand Trunk Road.

NCERT: Sher Shah Suri built the Shahi (Royal) road to strengthen and consolidate his empire from the Indus Valley to the Sonar Valley in Bengal. This road was renamed the Grand Trunk (GT) road during the British period, connecting Calcutta and Peshawar...

..On the basis of the width of the track of the Indian Railways, three categories have been made: Broad gauge: The distance between rails in broad gauge is 1.676 metres. The total length of broad gauge lines was 63950 km (2019-20). Metre gauge: The distance between rails is one metre. Its total length was 2402 km (2019-20). Narrow gauge: The distance between the rails in this case is 0.762 metres or 0.610 metres. The total length of the narrow gauge was 1604 km (2019-20). It is generally confined to hilly areas.

The National Highways Authority of India (NHAI) has taken up some major projects in the country under different phases :

a-Golden Quadrilateral.

b- North-South and East-West Corridors.