Question

Determine the meter of the following line.

I almost fell asleep.
trochaic
iambic
anapestic
dactylic

Answer 1

it is iambic! :)

Answer 2

The meter of this line is iambic.
Iamb consists of an unstressed syllable followed by a stressed syllable. So here, I is unstressed, al- is stressed, most is unstressed, fell is stressed, a- is unstressed, and sleep is stressed.
Trochee is quite the opposite, so that is incorrect, and anapest and dactyl refer to three syllables.