The correct answer is: a) Drip irrigation
Drip irrigation is a type of irrigation that delivers water directly to the root zone of plants, either through small holes in tubing or through emitters that are placed at the base of each plant. This type of irrigation is very efficient, as it minimizes water loss due to evaporation and runoff. It is also well-suited for use in hilly areas, as it can be easily adapted to the contours of the land.
Canal irrigation is a type of irrigation that uses canals to transport water from a source, such as a river or a reservoir, to fields where it is used to irrigate crops. This type of irrigation is often used in large-scale agricultural operations, as it is relatively inexpensive to set up and maintain. However, it can be inefficient, as water can be lost through evaporation and seepage.
Sprinkler irrigation is a type of irrigation that uses sprinklers to spray water onto crops. This type of irrigation is often used in areas with low rainfall, as it can provide a more uniform application of water than other methods. However, it can be inefficient, as water can be lost through evaporation and wind drift.
Flood irrigation is a type of irrigation that involves flooding an entire field with water. This type of irrigation is often used in areas with low rainfall, as it can provide a large amount of water to crops quickly. However, it can be inefficient, as water can be lost through evaporation and runoff.
In conclusion, drip irrigation is the most suitable type of irrigation system for horticultural crops in hilly areas. It is efficient, well-suited to the contours of the land, and can be easily adapted to the needs of individual plants.