Which sentence does not contain any errors in comma usage?

a.
do you know where she was born how much she weighed, and what color hair she has?

b.
we hiked past the stream, through the ravine, and up the steep hill.

c.
some birds can walk fly, and swim.

d.
would 3: 00 4: 00, or 5: 00 be the best time to meet?

each poet admires poetry

they each admire poetry because they could just use an expression or verbally just say you but they both write in in poetry which shows they know how to write in poetry.

from the political point of view it could be said that the candidate   is an effective speaker because she takes a strong position on the issue. it is an open discussion but probably she is making a presentation and can choose which subjects she wants to address. she is very likely to attain her aim which is to convince voters to accept her proposal.

. a function is a relation in which each input has only one output. in the relation , y is a function of x, because for each input x (1, 2, 3, or 0), there is only one output y. x is not a function of y, because the input y = 3 has multiple outputs: x = 1 and x = 2.