Narrow and busy highways such as Dhaka- Chittagong will take almost take 20 hours of transport time, lack of alternative transportation mode e. g., rail also offers very limited capacity. Unavailability of deep sea harbor and inefficient management of Chittagong port and limited crane capacity and employee strike have increased the lead time by almost 10 days.

option a is correct.

step-by-step explanation:

scale factor: it is used to find proportional measurements.

proportions means having the same ratio.

scale factor is the ratio of the model measurement to the actual measurement in a simplest form.

or we can say that the ratio of any two corresponding lengths in two similar geometric figures

if the scale factor is more than 1, then it is an enlargement,

if the scale factor less than 1, then it is a reduction.

given the two geometric figure:

by definition of proportions, we have