Which sentence contains a dangling modifier?
a) after walking to school, the bus slowly passed by.
b) the school bus has a morning and afternoon route.
c) several students walk home together in the evening.
d) while waiting for the bus, egypt ate her breakfast.

Option A, After walking to school, the bus slowly passed by.

Explanation:

When the sentence itself is not clear about what is being modified, then the modifier is termed as dangling modifier

Sometime these dangling modifier refer to a word with in a sentence that does not even appear in it.

Here the phrase "After walking to" does not make any sense as a modifier . it is not directly modifying the work school but it intends to modify it.  

Option A is correct

as the gila monster consumes the eggs or young of the desert cottontail and gambel's quail, thus its main food supply is only accessible for a restricted time duration every year. however, for this, the gila monsters exhibit three adaptations, which elevate their survival rate in the desert condition.  

first, is that they possess huge bodies, and can consume greater concentrations of food during a small period. secondly, they require to feed infrequently as they can accumulate fat in their tails. ultimately, their rate of metabolism is very low, so that they can burn their reservoirs of fat gradually.