(D) Pakistan
Pakistan has the highest HDI rank number (150) among the four countries, which means it has the lowest position/worst performance in the Human Development Index.
In HDI ranking, a higher rank number = lower development. Pakistan's rank of 150 is the highest number in the table, so it has the lowest HDI standing. Students often confuse "highest rank number" with "best performance" — remember, Rank 1 is the best, so a larger rank number means poorer development.