Step 1: The question asks which listed cause contributes least to infant deaths in India. Among the options, birth injuries account for the smallest share, so option c is correct.
Step 2: The leading causes of infant mortality in India are infections (such as sepsis, pneumonia and diarrhoea) and prematurity with low birth weight. These dominate both neonatal and post-neonatal deaths.
Step 3: Congenital malformations contribute a moderate share, more than birth injuries but less than infections and prematurity.
Step 4: Birth injuries (such as birth asphyxia related trauma) have declined with improved obstetric and neonatal care, making them the least common of the four. Hence options a, b and d are more frequent contributors and are not the answer.